diff --git a/onnxruntime/core/providers/webnn/builders/helper.h b/onnxruntime/core/providers/webnn/builders/helper.h
index c27e82ee7f54a..218677a1945d5 100644
--- a/onnxruntime/core/providers/webnn/builders/helper.h
+++ b/onnxruntime/core/providers/webnn/builders/helper.h
@@ -227,7 +227,7 @@ static const InlinedHashMap<std::string, std::string> op_map = {
     {"GlobalLpPool", "l2Pool2d"},
     {"Greater", "greater"},
     {"GreaterOrEqual", "greaterOrEqual"},
-    {"Gru", "gru"},
+    {"GRU", "gru"},
     {"HardSigmoid", "hardSigmoid"},
     {"HardSwish", "hardSwish"},
     {"Identity", "identity"},
diff --git a/onnxruntime/core/providers/webnn/builders/impl/gru_op_builder.cc b/onnxruntime/core/providers/webnn/builders/impl/gru_op_builder.cc
index c92fe7366d494..ffb9b7fbf2e7a 100644
--- a/onnxruntime/core/providers/webnn/builders/impl/gru_op_builder.cc
+++ b/onnxruntime/core/providers/webnn/builders/impl/gru_op_builder.cc
@@ -28,6 +28,8 @@ class GruOpBuilder : public BaseOpBuilder {
                          const WebnnDeviceType /*device_type*/, const logging::Logger& logger) const override;
   bool HasSupportedInputsImpl(const Node& node, const emscripten::val& wnn_limits,
                               const logging::Logger& logger) const override;
+  bool HasSupportedOutputsImpl(const Node& node, const emscripten::val& wnn_limits,
+                               const logging::Logger& logger) const override;
 };
 
 void GruOpBuilder::AddInitializersToSkip(ModelBuilder& model_builder, const Node& node) const {
@@ -189,40 +191,64 @@ bool GruOpBuilder::HasSupportedInputsImpl(const Node& node, const emscripten::va
                                           const logging::Logger& logger) const {
   const auto& input_defs = node.InputDefs();
   const auto& op_type = node.OpType();
-  int32_t input0_type = 0;  // input data type
-  int32_t input1_type = 0;  // weight data type
-  int32_t input2_type = 0;  // recurrentWeight data type
-  int32_t input3_type = 0;  // bias data type
-  int32_t input4_type = 0;  // recurrentBias data type
-  int32_t input5_type = 0;  // initialHiddenState data type
-  bool has_input3 = input_defs.size() > 3 && input_defs[3]->Exists();
-  bool has_input4 = input_defs.size() > 4 && input_defs[4]->Exists();
-  bool has_input5 = input_defs.size() > 5 && input_defs[5]->Exists();
-
-  if (!GetType(*input_defs[0], input0_type, logger) ||
-      !GetType(*input_defs[1], input1_type, logger) ||
-      !GetType(*input_defs[2], input2_type, logger) ||
-      (has_input3 && !GetType(*input_defs[3], input3_type, logger)) ||
-      (has_input4 && !GetType(*input_defs[4], input4_type, logger)) ||
-      (has_input5 && !GetType(*input_defs[5], input5_type, logger))) {
+  int32_t input_X_type = 0;          // input data type
+  int32_t input_W_type = 0;          // weight data type
+  int32_t input_R_type = 0;          // recurrent weight data type
+  int32_t input_B_type = 0;          // bias data type
+  int32_t input_initial_h_type = 0;  // initial hidden state data type
+  bool has_input_B = input_defs.size() > 3 && input_defs[3]->Exists();
+  bool has_input_initial_h = input_defs.size() > 5 && input_defs[5]->Exists();
+
+  if (!GetType(*input_defs[0], input_X_type, logger) ||
+      !GetType(*input_defs[1], input_W_type, logger) ||
+      !GetType(*input_defs[2], input_R_type, logger) ||
+      (has_input_B && !GetType(*input_defs[3], input_B_type, logger)) ||
+      // input_defs[4] refers to sequence_lens and is a fixed data type of int32.
+      (has_input_initial_h && !GetType(*input_defs[5], input_initial_h_type, logger))) {
     return false;
   }
 
-  InlinedVector<int32_t, 6> input_types = {input0_type, input1_type, input2_type};
-  if (has_input3) {
-    input_types.push_back(input3_type);
+  InlinedVector<int32_t, 5> input_types = {input_X_type, input_W_type, input_R_type};
+  if (has_input_B) {
+    input_types.push_back(input_B_type);
   }
-  if (has_input4) {
-    input_types.push_back(input4_type);
-  }
-  if (has_input5) {
-    input_types.push_back(input5_type);
+  if (has_input_initial_h) {
+    input_types.push_back(input_initial_h_type);
   }
   if (!AreInputDataTypesSame(op_type, input_types, logger)) {
     return false;
   }
 
-  return IsDataTypeSupportedByOp(op_type, input0_type, wnn_limits, "input", "X", logger);
+  return IsDataTypeSupportedByOp(op_type, input_X_type, wnn_limits, "input", "X", logger);
+}
+
+bool GruOpBuilder::HasSupportedOutputsImpl(const Node& node,
+                                           const emscripten::val& wnn_limits,
+                                           const logging::Logger& logger) const {
+  const auto& output_defs = node.OutputDefs();
+  const auto& op_type = node.OpType();
+  int32_t Y_type = 0;
+  int32_t Y_h_type = 0;
+  bool has_Y = output_defs.size() > 0 && output_defs[0]->Exists();
+  bool has_Y_h = output_defs.size() > 1 && output_defs[1]->Exists();
+
+  bool Y_supported = has_Y && GetType(*output_defs[0], Y_type, logger);
+  bool Y_h_supported = has_Y_h && GetType(*output_defs[1], Y_h_type, logger);
+
+  if (Y_supported && !Y_h_supported) {
+    return IsDataTypeSupportedByOp(op_type, Y_type, wnn_limits, "outputs", "Y", logger);
+  } else if (!Y_supported && Y_h_supported) {
+    return IsDataTypeSupportedByOp(op_type, Y_h_type, wnn_limits, "outputs", "Y_h", logger);
+  } else if (Y_supported && Y_h_supported) {
+    if (Y_type != Y_h_type) {
+      LOGS(logger, VERBOSE) << "[GRU] Output data types must be the same.";
+      return false;
+    }
+    return IsDataTypeSupportedByOp(op_type, Y_type, wnn_limits, "outputs", "Y", logger);
+  } else {
+    LOGS(logger, VERBOSE) << "[GRU] No output found.";
+    return false;
+  }
 }
 
 void CreateGruOpBuilder(const std::string& op_type, OpBuilderRegistrations& op_registrations) {