diff --git a/include/xlnt/workbook/workbook.hpp b/include/xlnt/workbook/workbook.hpp
index f7aa4e3c2..1b977aefe 100644
--- a/include/xlnt/workbook/workbook.hpp
+++ b/include/xlnt/workbook/workbook.hpp
@@ -82,6 +82,7 @@ struct stylesheet;
 struct workbook_impl;
 class xlsx_consumer;
 class xlsx_producer;
+struct defined_name;
 
 } // namespace detail
 
@@ -751,6 +752,38 @@ class XLNT_API workbook
     /// </summary>
     bool known_fonts_enabled() const;
 
+    // Defined Names
+    
+    /// <summary>
+    /// Add a defined name to a sheet
+    /// </summary
+    void add_defined_name(detail::defined_name name);
+
+    /// <summary>
+    /// Returns a copy of workbook defined names
+    /// </summary>
+    std::vector<detail::defined_name> get_defined_names() const;
+
+    /// <summary>
+    /// Returns a reference to a single defined name
+    /// </summary>
+    detail::defined_name &get_defined_name(const std::size_t index);
+
+    /// <summary>
+    /// Returns a reference to a single defined name. Finds the first name that matches, there may be multiple with the same name
+    /// </summary>
+    detail::defined_name &get_defined_name(const std::string &name);
+
+    /// <summary>
+    /// Removes the defined name at the given index
+    /// </summary>
+    void remove_defined_name(const std::size_t index);
+
+    /// <summary>
+    /// Removes the defined name that first matches the passed name.
+    /// </summary>
+    void remove_defined_name(const std::string &name);
+    
     // Manifest
 
     /// <summary>
diff --git a/include/xlnt/worksheet/worksheet.hpp b/include/xlnt/worksheet/worksheet.hpp
index a4cf9e077..a303c3f9d 100644
--- a/include/xlnt/worksheet/worksheet.hpp
+++ b/include/xlnt/worksheet/worksheet.hpp
@@ -64,7 +64,7 @@ namespace detail {
 
 class xlsx_consumer;
 class xlsx_producer;
-
+struct defined_name;
 struct worksheet_impl;
 
 } // namespace detail
@@ -729,6 +729,38 @@ class XLNT_API worksheet
     /// </summary>
     cell_reference active_cell() const;
 
+     // Defined Names
+
+    /// <summary>
+    /// Add a defined name to a sheet
+    /// </summary
+    void add_defined_name(detail::defined_name name);
+
+    /// <summary>
+    /// Returns a copy of workbook defined names
+    /// </summary>
+    std::vector<detail::defined_name> get_defined_names() const;
+
+    /// <summary>
+    /// Returns a reference to a single defined name
+    /// </summary>
+    detail::defined_name &get_defined_name(const std::size_t index);
+
+    /// <summary>
+    /// Returns a reference to a single defined name. Finds the first name that matches, there may be multiple with the same name
+    /// </summary>
+    detail::defined_name &get_defined_name(const std::string &name);
+
+    /// <summary>
+    /// Removes the defined name at the given index
+    /// </summary>
+    void remove_defined_name(const std::size_t index);
+
+    /// <summary>
+    /// Removes the defined name that first matches the passed name.
+    /// </summary>
+    void remove_defined_name(const std::string &name);
+
     // page breaks
 
     /// <summary>
diff --git a/source/detail/implementations/workbook_impl.hpp b/source/detail/implementations/workbook_impl.hpp
index 338146188..1f5c8301a 100644
--- a/source/detail/implementations/workbook_impl.hpp
+++ b/source/detail/implementations/workbook_impl.hpp
@@ -29,6 +29,7 @@
 
 #include <detail/implementations/stylesheet.hpp>
 #include <detail/implementations/worksheet_impl.hpp>
+#include <detail/serialization/defined_name.hpp>
 #include <xlnt/packaging/ext_list.hpp>
 #include <xlnt/packaging/manifest.hpp>
 #include <xlnt/utils/datetime.hpp>
@@ -88,11 +89,20 @@ struct workbook_impl
         extended_properties_ = other.extended_properties_;
         custom_properties_ = other.custom_properties_;
 
+        defined_names_ = other.defined_names_;
+
         return *this;
     }
 
-    bool operator==(const workbook_impl &other)
+    bool operator==(const workbook_impl &other) const
     {
+        if (defined_names_.size() != other.defined_names_.size()) return false;
+
+        for (std::size_t i = 0; i < defined_names_.size(); i++)
+        {
+            if (defined_names_[i] != other.defined_names_[i]) return false;
+        }
+
         return active_sheet_index_ == other.active_sheet_index_
             && worksheets_ == other.worksheets_
             && shared_strings_ids_ == other.shared_strings_ids_
@@ -168,6 +178,7 @@ struct workbook_impl
     optional<std::string> abs_path_;
     optional<std::size_t> arch_id_flags_;
     optional<ext_list> extensions_;
+    std::vector<defined_name> defined_names_;
 };
 
 } // namespace detail
diff --git a/source/detail/implementations/worksheet_impl.hpp b/source/detail/implementations/worksheet_impl.hpp
index 7afcfb1d5..94f6af0c3 100644
--- a/source/detail/implementations/worksheet_impl.hpp
+++ b/source/detail/implementations/worksheet_impl.hpp
@@ -41,6 +41,7 @@
 #include <xlnt/worksheet/print_options.hpp>
 #include <xlnt/worksheet/sheet_pr.hpp>
 #include <detail/implementations/cell_impl.hpp>
+#include <detail/serialization/defined_name.hpp>
 
 namespace xlnt {
 
@@ -88,6 +89,8 @@ struct worksheet_impl
         extension_list_ = other.extension_list_;
         sheet_properties_ = other.sheet_properties_;
         print_options_ = other.print_options_;
+        defined_names_ = other.defined_names_;
+
 
         for (auto &cell : cell_map_)
         {
@@ -97,8 +100,15 @@ struct worksheet_impl
 
     workbook *parent_;
 
-    bool operator==(const worksheet_impl& rhs) const
+    bool operator==(const worksheet_impl &rhs) const
     {
+        if (defined_names_.size() != rhs.defined_names_.size()) return false;
+        
+        for (std::size_t i = 0; i < defined_names_.size(); i++)
+        {
+            if (defined_names_[i] != rhs.defined_names_[i]) return false;
+        }
+
         return id_ == rhs.id_
             && title_ == rhs.title_
             && format_properties_ == rhs.format_properties_
@@ -122,6 +132,7 @@ struct worksheet_impl
             && print_options_ == rhs.print_options_
             && sheet_properties_ == rhs.sheet_properties_
             && extension_list_ == rhs.extension_list_;
+      
     }
 
     std::size_t id_;
@@ -160,6 +171,8 @@ struct worksheet_impl
 
     std::string drawing_rel_id_;
     optional<drawing::spreadsheet_drawing> drawing_;
+
+    std::vector<defined_name> defined_names_;
 };
 
 } // namespace detail
diff --git a/source/detail/serialization/defined_name.hpp b/source/detail/serialization/defined_name.hpp
index 3aeb91323..82a44ead1 100644
--- a/source/detail/serialization/defined_name.hpp
+++ b/source/detail/serialization/defined_name.hpp
@@ -30,10 +30,63 @@ namespace detail {
 
 struct defined_name
 {
-    std::string name;
-    std::size_t sheet_id;
-    bool hidden;
-    std::string value;
+
+    defined_name &operator=(const defined_name &other)
+    {
+        name = other.name;
+        comment = other.comment;
+        custom_menu = other.custom_menu;
+        description = other.description;
+        help = other.help;
+
+        status_bar = other.status_bar;
+        sheet_id = other.sheet_id;
+        hidden = other.hidden;
+        function = other.function;
+        function_group_id = other.function_group_id;
+
+        shortcut_key = other.shortcut_key;
+        value = other.value;
+
+        return *this;
+    }
+
+    bool operator==(const defined_name &other) const
+    {
+        return name == other.name
+            && comment == other.comment
+            && custom_menu == other.custom_menu
+            && description == other.description
+            && help == other.help
+            && status_bar == other.status_bar
+            && sheet_id == other.sheet_id
+            && hidden == other.hidden
+            && function == other.function
+            && function_group_id == other.function_group_id
+            && shortcut_key == other.shortcut_key
+            && value == other.value;
+    }
+
+    bool operator!=(const defined_name &other) const
+    {
+        return !(*this == other);
+    }
+
+    // Implements (most of) CT_RevisionDefinedName, there's several "old" members in the spec but they're also ignored in other librarie
+    std::string name;                       // A string representing the name for this defined name.
+    optional<std::string> comment;          // A string representing a comment about the defined name.
+    optional<std::string> custom_menu;      // A string representing the new custom menu text
+    optional<std::string> description;      // A string representing the new description text for the defined name.
+    optional<std::string> help;             // A string representing the new help topic text.
+    optional<std::string> status_bar;       // A string representing the new status bar text.
+    optional<std::size_t> sheet_id;         // An integer representing the id of the sheet to which this defined name belongs. This shall be used local defined names only. 0 indexed indexed.
+    optional<bool> hidden;                  // A Boolean value indicating whether the named range is now hidden.
+    optional<bool> function;                // A Boolean value indicating that the defined name refers to a function. True if the defined name is a function, false otherwise.
+    optional<std::size_t> function_group_id;// Represents the new function group id.
+    optional<std::string> shortcut_key;     // Represents the new keyboard shortcut. This is unsigned byte in the spec, but openpyxl uses string so let's try that
+    std::string value;                      // The actual value of the name, ie "='Sheet1'!A1"
+
+    
 };
 
 } // namespace detail
diff --git a/source/detail/serialization/xlsx_consumer.cpp b/source/detail/serialization/xlsx_consumer.cpp
index dc50106cb..1aa6a6d8c 100644
--- a/source/detail/serialization/xlsx_consumer.cpp
+++ b/source/detail/serialization/xlsx_consumer.cpp
@@ -534,7 +534,7 @@ std::string xlsx_consumer::read_worksheet_begin(const std::string &rel_id)
     expect_start_element(qn("spreadsheetml", "worksheet"), xml::content::complex); // CT_Worksheet
     skip_attributes({qn("mc", "Ignorable")});
     
-    read_defined_names(ws, defined_names_);
+    read_defined_names(ws, ws.d_->defined_names_);
 
     while (in_element(qn("spreadsheetml", "worksheet")))
     {
@@ -2082,16 +2082,61 @@ void xlsx_consumer::read_office_document(const std::string &content_type) // CT_
 
                 defined_name name;
                 name.name = parser().attribute("name");
-                name.sheet_id = parser().attribute<std::size_t>("localSheetId");
-                name.hidden = false;
+
+                if (parser().attribute_present("comment"))
+                {
+                    name.comment = parser().attribute<std::string>("comment");
+                }
+
+                if (parser().attribute_present("customMenu"))
+                {
+                    name.custom_menu = parser().attribute<std::string>("customMenu");
+                }
+
+                if (parser().attribute_present("description"))
+                {
+                    name.description = parser().attribute<std::string>("description");
+                }
+
+                if (parser().attribute_present("help"))
+                {
+                    name.help = parser().attribute<std::string>("help");
+                }
+
+                if (parser().attribute_present("statusBar"))
+                {
+                    name.status_bar = parser().attribute<std::string>("statusBar");
+                }
+
+                if (parser().attribute_present("localSheetId"))
+                {
+                    name.sheet_id = parser().attribute<std::size_t>("localSheetId");
+                }
+                
                 if (parser().attribute_present("hidden"))
                 {
                     name.hidden = is_true(parser().attribute("hidden"));
                 }
+
+                if (parser().attribute_present("function"))
+                {
+                    name.function = is_true(parser().attribute("function"));
+                }
+
+                if (parser().attribute_present("functionGroupId"))
+                {
+                    name.function_group_id = parser().attribute<std::size_t>("functionGroupId");
+                }
+
+                if (parser().attribute_present("shortcutKey"))
+                {
+                    name.shortcut_key = parser().attribute<std::string>("shortcutKey");
+                }
+
                 parser().attribute_map(); // skip remaining attributes
                 name.value = read_text();
-                defined_names_.push_back(name);
-                
+                target_.d_->defined_names_.push_back(name);
+
                 expect_end_element(qn("spreadsheetml", "definedName"));
             }
         }
@@ -2195,6 +2240,7 @@ void xlsx_consumer::read_office_document(const std::string &content_type) // CT_
         }
     }
 
+    std::vector<defined_name> workbook_names;
     for (auto worksheet_rel : manifest().relationships(workbook_path, relationship_type::worksheet))
     {
         auto title = std::find_if(target_.d_->sheet_title_rel_id_map_.begin(),
@@ -2203,7 +2249,7 @@ void xlsx_consumer::read_office_document(const std::string &content_type) // CT_
                 return p.second == worksheet_rel.id();
             })->first;
 
-        auto id = sheet_title_id_map_[title];
+        auto id = sheet_title_id_map_[title]; // 1-indexed
         auto index = sheet_title_index_map_[title];
 
         auto insertion_iter = target_.d_->worksheets_.begin();
@@ -2215,11 +2261,34 @@ void xlsx_consumer::read_office_document(const std::string &content_type) // CT_
 
         current_worksheet_ = &*target_.d_->worksheets_.emplace(insertion_iter, &target_, id, title);
 
+        // If there's any defined names that are worksheet specific, move them here.
+        for (std::size_t i = 0; i < target_.d_->defined_names_.size(); i++)
+        {
+            const auto &name = target_.d_->defined_names_[i];
+            if (name.sheet_id.is_set())
+            {
+                const auto target_id = name.sheet_id.get();
+                if (target_id == index)
+                {
+                    // It's a match, remove it from the workbook and add it to the sheet
+                    current_worksheet_->defined_names_.push_back(name);
+                }
+            }
+            else
+            {
+                // Name is global and belongs to the workbook, if i'ts not already added
+                if (std::find(workbook_names.begin(), workbook_names.end(), name) == workbook_names.end())
+                    workbook_names.push_back(name);
+            }
+        }
+
         if (!streaming_)
         {
             read_part({workbook_rel, worksheet_rel});
         }
     }
+    // Update the workbook with the new defined names
+    target_.d_->defined_names_ = workbook_names;
 }
 
 // Write Workbook Relationship Target Parts
diff --git a/source/detail/serialization/xlsx_producer.cpp b/source/detail/serialization/xlsx_producer.cpp
index 6f6e26ccc..06051958f 100644
--- a/source/detail/serialization/xlsx_producer.cpp
+++ b/source/detail/serialization/xlsx_producer.cpp
@@ -435,6 +435,9 @@ void xlsx_producer::write_workbook(const relationship &rel)
     std::size_t num_visible = 0;
     std::vector<defined_name> defined_names;
 
+    defined_names = source_.d_->defined_names_;
+    std::size_t sheet_id = 1;
+
     for (auto ws : source_)
     {
         if (!ws.has_page_setup() || ws.page_setup().sheet_state() == sheet_state::visible)
@@ -444,30 +447,35 @@ void xlsx_producer::write_workbook(const relationship &rel)
         
         auto title_ref = "'" + ws.title() + "'!";
         
+        bool added_auto_filter = false;
+        bool added_print_area = false;
+        bool added_print_titles = false;
         if (ws.has_auto_filter())
         {
             defined_name name;
-            name.sheet_id = ws.id();
+            name.sheet_id = sheet_id;
             name.name = "_xlnm._FilterDatabase";
             name.hidden = true;
             name.value = title_ref + range_reference::make_absolute(ws.auto_filter()).to_string();
             defined_names.push_back(name);
+            added_auto_filter = true;
         }
         
         if (ws.has_print_area())
         {
             defined_name name;
-            name.sheet_id = ws.id();
+            name.sheet_id = sheet_id;
             name.name = "_xlnm.Print_Area";
             name.hidden = false;
             name.value = title_ref + range_reference::make_absolute(ws.print_area()).to_string();
             defined_names.push_back(name);
+            added_print_area = true;
         }
         
         if (ws.has_print_titles())
         {
             defined_name name;
-            name.sheet_id = ws.id();
+            name.sheet_id = sheet_id;
             name.name = "_xlnm.Print_Titles";
             name.hidden = false;
             
@@ -489,7 +497,22 @@ void xlsx_producer::write_workbook(const relationship &rel)
             }
 
             defined_names.push_back(name);
+            added_print_titles = true;
+        }
+        // Add any sheet defined names to the vector
+        for (auto &sheet_defined_name : ws.d_->defined_names_)
+        {
+            sheet_defined_name.sheet_id = sheet_id;
+            if (sheet_defined_name.name == "_xlnm._FilterDatabase" && !added_auto_filter)
+                defined_names.push_back(sheet_defined_name);
+            else if (sheet_defined_name.name == "_xlnm.Print_Area" && !added_print_area)
+                defined_names.push_back(sheet_defined_name);
+            else if (sheet_defined_name.name == "_xlnm.Print_Titles" && !added_print_titles)
+                defined_names.push_back(sheet_defined_name);
+            else if (!added_auto_filter && !added_print_area && !added_print_titles)
+                defined_names.push_back(sheet_defined_name);
         }
+        sheet_id++;
     }
 
     if (num_visible == 0)
@@ -664,11 +687,66 @@ void xlsx_producer::write_workbook(const relationship &rel)
         {
             write_start_element(xmlns, "definedName");
             write_attribute("name", name.name);
-            if (name.hidden)
+
+            if (name.comment.is_set())
             {
-                write_attribute("hidden", write_bool(true));
+                write_attribute("comment", name.comment.get());
             }
-            write_attribute("localSheetId", std::to_string(name.sheet_id - 1)); // 0-indexed for some reason
+
+            if (name.custom_menu.is_set())
+            {
+                write_attribute("customMenu", name.custom_menu.get());
+            }
+
+            if (name.description.is_set())
+            {
+                write_attribute("description", name.description.get());
+            }
+
+            if (name.help.is_set())
+            {
+                write_attribute("help", name.help.get());
+            }
+
+            if (name.status_bar.is_set())
+            {
+                write_attribute("statusBar", name.status_bar.get());
+            }
+
+            if (name.sheet_id.is_set())
+            {
+                write_attribute("localSheetId", std::to_string(name.sheet_id.get() - 1)); // Don't think this is meant to require subtracting 1?
+            }
+
+            if (name.hidden.is_set())
+            {
+                const auto hidden_state = name.hidden.get();
+                if (hidden_state)
+                {
+                    write_attribute("hidden", write_bool(true));
+                }
+            }
+
+            if (name.function.is_set())
+            {
+                const auto function_state = name.function.get();
+                if (function_state)
+                {
+                    write_attribute("function", write_bool(true));
+                }
+            }
+
+            if (name.function_group_id.is_set())
+            {
+                const auto function_group_id = name.function_group_id.get();
+                write_attribute("functionGroupId", std::to_string(function_group_id));
+            }
+
+            if (name.shortcut_key.is_set())
+            {
+                write_attribute("shortcutKey", name.shortcut_key.get());
+            }
+
             write_characters(name.value);
             write_end_element(xmlns, "definedName");
         }
diff --git a/source/workbook/workbook.cpp b/source/workbook/workbook.cpp
index dce9d3bd0..6bf067494 100644
--- a/source/workbook/workbook.cpp
+++ b/source/workbook/workbook.cpp
@@ -60,6 +60,7 @@
 #include <detail/serialization/open_stream.hpp>
 #include <detail/serialization/vector_streambuf.hpp>
 #include <detail/serialization/xlsx_consumer.hpp>
+#include <detail/serialization/defined_name.hpp>
 #include <detail/serialization/xlsx_producer.hpp>
 
 namespace {
@@ -1713,4 +1714,50 @@ void workbook::reorder_relationships()
     }
 }
 
+void workbook::add_defined_name(detail::defined_name name)
+{
+    d_->defined_names_.push_back(name);
+}
+
+std::vector<detail::defined_name> workbook::get_defined_names() const
+{
+    return d_->defined_names_;
+}
+
+detail::defined_name &workbook::get_defined_name(const std::size_t index)
+{
+    return d_->defined_names_[index];
+}
+
+detail::defined_name &workbook::get_defined_name(const std::string &name)
+{
+    // Only return the first matching
+    for (auto &defined_name : d_->defined_names_)
+        if (defined_name.name == name)
+            return defined_name;
+    throw key_not_found();
+}
+
+void workbook::remove_defined_name(const std::size_t index)
+{
+    d_->defined_names_.erase(d_->defined_names_.begin() + index);
+}
+
+void workbook::remove_defined_name(const std::string &name)
+{
+    // Only remove first matching
+    std::size_t offending_index = 0;
+    std::size_t index = 0;
+    for (auto &defined_name : d_->defined_names_)
+    {
+        if (defined_name.name == name)
+        {
+            offending_index = index;
+            break;
+        }
+        index++;
+    }
+    if (d_->defined_names_.size() > 0)
+        remove_defined_name(offending_index);
+}
 } // namespace xlnt
diff --git a/source/worksheet/worksheet.cpp b/source/worksheet/worksheet.cpp
index bd64ac37d..9b3829a79 100644
--- a/source/worksheet/worksheet.cpp
+++ b/source/worksheet/worksheet.cpp
@@ -1352,4 +1352,51 @@ bool worksheet::is_empty() const
     return d_->cell_map_.empty();
 }
 
+void worksheet::add_defined_name(detail::defined_name name)
+{
+    d_->defined_names_.push_back(name);
+}
+
+std::vector<detail::defined_name> worksheet::get_defined_names() const
+{
+    return d_->defined_names_;
+}
+
+detail::defined_name &worksheet::get_defined_name(const std::size_t index)
+{
+    return d_->defined_names_[index];
+}
+
+detail::defined_name &worksheet::get_defined_name(const std::string &name)
+{
+    // Only return the first matching
+    for (auto &defined_name : d_->defined_names_)
+        if (defined_name.name == name)
+            return defined_name;
+    throw key_not_found();
+}
+
+void worksheet::remove_defined_name(const std::size_t index)
+{
+    d_->defined_names_.erase(d_->defined_names_.begin() + index);
+}
+
+void worksheet::remove_defined_name(const std::string &name)
+{
+    // Only remove first matching
+    std::size_t offending_index = 0;
+    std::size_t index = 0;
+    for (auto &defined_name : d_->defined_names_)
+    {
+        if (defined_name.name == name)
+        {
+            offending_index = index;
+            break;
+        }
+        index++;
+    }
+    if (d_->defined_names_.size() > 0)
+        remove_defined_name(offending_index);
+}
+
 } // namespace xlnt
diff --git a/tests/data/19_defined_names.xlsx b/tests/data/19_defined_names.xlsx
index 4c430ba35..a1708d863 100644
Binary files a/tests/data/19_defined_names.xlsx and b/tests/data/19_defined_names.xlsx differ
diff --git a/tests/workbook/serialization_test_suite.cpp b/tests/workbook/serialization_test_suite.cpp
index ca6383a18..8fea0ede2 100644
--- a/tests/workbook/serialization_test_suite.cpp
+++ b/tests/workbook/serialization_test_suite.cpp
@@ -73,6 +73,7 @@ class serialization_test_suite : public test_suite
         register_test(test_Issue503_external_link_load);
         register_test(test_formatting);
         register_test(test_active_sheet);
+        register_test(test_named_range);
     }
 
     bool workbook_matches_file(xlnt::workbook &wb, const xlnt::path &file)
@@ -808,6 +809,11 @@ class serialization_test_suite : public test_suite
         wb.load(path_helper::test_file("20_active_sheet.xlsx"));
         xlnt_assert_equals(wb.active_sheet(), wb[2]);
     }
+
+    void test_named_range()
+    {
+        xlnt_assert(round_trip_matches_rw(path_helper::test_file("19_defined_names.xlsx")));
+    }
 };
 
 static serialization_test_suite x;
diff --git a/tests/workbook/workbook_test_suite.cpp b/tests/workbook/workbook_test_suite.cpp
index 09e37660a..8dab88ac9 100644
--- a/tests/workbook/workbook_test_suite.cpp
+++ b/tests/workbook/workbook_test_suite.cpp
@@ -36,6 +36,7 @@
 #include <xlnt/workbook/worksheet_iterator.hpp>
 #include <xlnt/worksheet/range.hpp>
 #include <xlnt/worksheet/worksheet.hpp>
+#include <detail/serialization/defined_name.hpp>
 
 class workbook_test_suite : public test_suite
 {
@@ -60,6 +61,9 @@ class workbook_test_suite : public test_suite
         register_test(test_add_named_range);
         register_test(test_get_named_range);
         register_test(test_remove_named_range);
+        register_test(test_add_defined_name);
+        register_test(test_modify_defined_name);
+        register_test(test_remove_defined_name);
         register_test(test_post_increment_iterator);
         register_test(test_copy_iterator);
         register_test(test_manifest);
@@ -342,6 +346,63 @@ class workbook_test_suite : public test_suite
         xlnt_assert_throws(wb.remove_named_range("test_nr2"), std::runtime_error);
     }
 
+    void test_add_defined_name()
+    {
+        xlnt::workbook wb;
+        auto new_sheet = wb.create_sheet();
+
+        xlnt::detail::defined_name name;
+        const std::string dname = "Workbook Defined Name";
+        const std::string dcomment = "This should only exist on a workbook";
+        name.name = dname;
+        name.comment = dcomment;
+        name.value = "='Sheet1'!A1";
+        wb.add_defined_name(name);
+        
+        xlnt_assert(wb.get_defined_names().size() == 1);
+    }
+
+    void test_modify_defined_name()
+    {
+        xlnt::workbook wb;
+        auto new_sheet = wb.create_sheet();
+
+        xlnt::detail::defined_name name;
+        const std::string dname = "Workbook Defined Name";
+        const std::string dcomment = "This should only exist on a workbook";
+        name.name = dname;
+        name.comment = dcomment;
+        name.value = "='Sheet1'!A1";
+        wb.add_defined_name(name);
+
+        xlnt_assert(wb.get_defined_name(0).name == dname);
+        xlnt_assert(wb.get_defined_name(dname).comment == dcomment);
+
+        wb.get_defined_name(0).hidden = true;
+        xlnt_assert(wb.get_defined_name(0).hidden == true);
+
+        xlnt_assert_throws(wb.get_defined_name("Doesn't exist"), xlnt::key_not_found);
+    }
+
+    void test_remove_defined_name()
+    {
+        xlnt::workbook wb;
+        auto new_sheet = wb.create_sheet();
+
+        xlnt::detail::defined_name name;
+        const std::string dname = "Workbook Defined Name";
+        const std::string dcomment = "This should only exist on a workbook";
+        name.name = dname;
+        name.comment = dcomment;
+        name.value = "='Sheet1'!A1";
+        wb.add_defined_name(name);
+
+        xlnt_assert(wb.get_defined_names().size() == 1);
+        wb.remove_defined_name(dname);
+
+        xlnt_assert(wb.get_defined_names().size() == 0);
+    }
+
     void test_post_increment_iterator()
     {
         xlnt::workbook wb;
diff --git a/tests/worksheet/worksheet_test_suite.cpp b/tests/worksheet/worksheet_test_suite.cpp
index 9c1097a04..696dd3c48 100644
--- a/tests/worksheet/worksheet_test_suite.cpp
+++ b/tests/worksheet/worksheet_test_suite.cpp
@@ -29,6 +29,7 @@
 #include <xlnt/worksheet/range.hpp>
 #include <xlnt/worksheet/row_properties.hpp>
 #include <xlnt/worksheet/worksheet.hpp>
+#include <detail/serialization/defined_name.hpp>
 #include <helpers/test_suite.hpp>
 
 class worksheet_test_suite : public test_suite
@@ -111,6 +112,9 @@ class worksheet_test_suite : public test_suite
         register_test(test_hidden_sheet);
         register_test(test_xlsm_read_write);
         register_test(test_issue_484);
+        register_test(test_add_defined_name);
+        register_test(test_modify_defined_name);
+        register_test(test_remove_defined_name);
     }
 
     void test_new_worksheet()
@@ -1674,6 +1678,69 @@ class worksheet_test_suite : public test_suite
         xlnt_assert_equals("B12:B12", ws.columns(true).reference());
         xlnt_assert_equals("A1:B12", ws.columns(false).reference());
     }
+
+    
+    void test_add_defined_name()
+    {
+        xlnt::workbook wb;
+        auto ws = wb.create_sheet();
+
+        xlnt::detail::defined_name name;
+        const std::string dname = "Worksheet Defined Name";
+        const std::string dcomment = "This should only exist on a Worksheet";
+        name.name = dname;
+        name.comment = dcomment;
+        name.value = "='Sheet1'!A1";
+        ws.add_defined_name(name);
+
+        xlnt_assert(ws.get_defined_names().size() == 1);
+        ws = wb.create_sheet();
+        xlnt_assert(ws.get_defined_names().size() == 0);
+    }
+
+    void test_modify_defined_name()
+    {
+        xlnt::workbook wb;
+        auto ws = wb.create_sheet();
+
+        xlnt::detail::defined_name name;
+        const std::string dname = "Worksheet Defined Name";
+        const std::string dcomment = "This should only exist on a Worksheet";
+        name.name = dname;
+        name.comment = dcomment;
+        name.value = "='Sheet1'!A1";
+        ws.add_defined_name(name);
+
+        xlnt_assert(ws.get_defined_name(0).name == dname);
+        xlnt_assert(ws.get_defined_name(dname).comment == dcomment);
+
+        ws.get_defined_name(0).hidden = true;
+        xlnt_assert(ws.get_defined_name(0).hidden == true);
+
+        xlnt_assert_throws(ws.get_defined_name("Doesn't exist"), xlnt::key_not_found);
+
+        ws = wb.create_sheet();
+        xlnt_assert_throws(ws.get_defined_name(dname), xlnt::key_not_found);
+    }
+
+    void test_remove_defined_name()
+    {
+        xlnt::workbook wb;
+        auto ws = wb.create_sheet();
+
+        xlnt::detail::defined_name name;
+        const std::string dname = "Worksheet Defined Name";
+        const std::string dcomment = "This should only exist on a Worksheet";
+        name.name = dname;
+        name.comment = dcomment;
+        name.value = "='Sheet1'!A1";
+        ws.add_defined_name(name);
+
+        xlnt_assert(ws.get_defined_names().size() == 1);
+        ws.remove_defined_name(dname);
+
+        xlnt_assert(ws.get_defined_names().size() == 0);
+    }
 };
 
 static worksheet_test_suite x;