diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3055b15011a2f..f8faf728c2b66 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -81,7 +81,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Deprecated `LightningModule.model_size` ([#8343](https://github.com/PyTorchLightning/pytorch-lightning/pull/8343))
 
 
--
+- Deprecated `DataModule` properties: `train_transforms`, `val_transforms`, `test_transforms`, `size`, `dims` ([#8851](https://github.com/PyTorchLightning/pytorch-lightning/pull/8851))
 
 
 -
diff --git a/pytorch_lightning/core/datamodule.py b/pytorch_lightning/core/datamodule.py
index b4273d550fd09..60cbaaaf758e9 100644
--- a/pytorch_lightning/core/datamodule.py
+++ b/pytorch_lightning/core/datamodule.py
@@ -70,6 +70,20 @@ def teardown(self):
 
     def __init__(self, train_transforms=None, val_transforms=None, test_transforms=None, dims=None):
         super().__init__()
+        if train_transforms is not None:
+            rank_zero_deprecation(
+                "DataModule property `train_transforms` was deprecated in v1.5 and will be removed in v1.7."
+            )
+        if val_transforms is not None:
+            rank_zero_deprecation(
+                "DataModule property `val_transforms` was deprecated in v1.5 and will be removed in v1.7."
+            )
+        if test_transforms is not None:
+            rank_zero_deprecation(
+                "DataModule property `test_transforms` was deprecated in v1.5 and will be removed in v1.7."
+            )
+        if dims is not None:
+            rank_zero_deprecation("DataModule property `dims` was deprecated in v1.5 and will be removed in v1.7.")
         self._train_transforms = train_transforms
         self._val_transforms = val_transforms
         self._test_transforms = test_transforms
@@ -95,55 +109,94 @@ def __init__(self, train_transforms=None, val_transforms=None, test_transforms=N
     def train_transforms(self):
         """
         Optional transforms (or collection of transforms) you can apply to train dataset
+
+        .. deprecated:: v1.5
+            Will be removed in v1.7.0.
         """
+
+        rank_zero_deprecation(
+            "DataModule property `train_transforms` was deprecated in v1.5 and will be removed in v1.7."
+        )
         return self._train_transforms
 
     @train_transforms.setter
     def train_transforms(self, t):
+        rank_zero_deprecation(
+            "DataModule property `train_transforms` was deprecated in v1.5 and will be removed in v1.7."
+        )
         self._train_transforms = t
 
     @property
     def val_transforms(self):
         """
         Optional transforms (or collection of transforms) you can apply to validation dataset
+
+        .. deprecated:: v1.5
+            Will be removed in v1.7.0.
         """
+
+        rank_zero_deprecation(
+            "DataModule property `val_transforms` was deprecated in v1.5 and will be removed in v1.7."
+        )
         return self._val_transforms
 
     @val_transforms.setter
     def val_transforms(self, t):
+        rank_zero_deprecation(
+            "DataModule property `val_transforms` was deprecated in v1.5 and will be removed in v1.7."
+        )
         self._val_transforms = t
 
     @property
     def test_transforms(self):
         """
         Optional transforms (or collection of transforms) you can apply to test dataset
+
+        .. deprecated:: v1.5
+            Will be removed in v1.7.0.
         """
+
+        rank_zero_deprecation(
+            "DataModule property `test_transforms` was deprecated in v1.5 and will be removed in v1.7."
+        )
         return self._test_transforms
 
     @test_transforms.setter
     def test_transforms(self, t):
+        rank_zero_deprecation(
+            "DataModule property `test_transforms` was deprecated in v1.5 and will be removed in v1.7."
+        )
         self._test_transforms = t
 
     @property
     def dims(self):
         """
         A tuple describing the shape of your data. Extra functionality exposed in ``size``.
+
+        .. deprecated:: v1.5
+            Will be removed in v1.7.0.
         """
+        rank_zero_deprecation("DataModule property `dims` was deprecated in v1.5 and will be removed in v1.7.")
         return self._dims
 
     @dims.setter
     def dims(self, d):
+        rank_zero_deprecation("DataModule property `dims` was deprecated in v1.5 and will be removed in v1.7.")
         self._dims = d
 
     def size(self, dim=None) -> Union[Tuple, int]:
         """
         Return the dimension of each input either as a tuple or list of tuples. You can index this
         just as you would with a torch tensor.
+
+        .. deprecated:: v1.5
+            Will be removed in v1.7.0.
         """
 
         if dim is not None:
             return self.dims[dim]
 
+        rank_zero_deprecation("DataModule property `size` was deprecated in v1.5 and will be removed in v1.7.")
         return self.dims
 
     @property
diff --git a/tests/deprecated_api/test_remove_1-7.py b/tests/deprecated_api/test_remove_1-7.py
index 38b1e50150063..d836f1427a110 100644
--- a/tests/deprecated_api/test_remove_1-7.py
+++ b/tests/deprecated_api/test_remove_1-7.py
@@ -15,8 +15,10 @@
 
 import pytest
 
+from pytorch_lightning import LightningDataModule
 from tests.deprecated_api import _soft_unimport_module
 from tests.helpers import BoringModel
+from tests.helpers.datamodules import MNISTDataModule
 
 
 def test_v1_7_0_deprecated_lightning_module_summarize(tmpdir):
@@ -46,3 +48,35 @@ def test_v1_7_0_deprecated_model_size():
         match="LightningModule.model_size` property was deprecated in v1.5 and will be removed in v1.7"
     ):
         _ = model.model_size
+
+
+def test_v1_7_0_datamodule_transform_properties(tmpdir):
+    dm = MNISTDataModule()
+    with pytest.deprecated_call(match=r"DataModule property `train_transforms` was deprecated in v1.5"):
+        dm.train_transforms = "a"
+    with pytest.deprecated_call(match=r"DataModule property `val_transforms` was deprecated in v1.5"):
+        dm.val_transforms = "b"
+    with pytest.deprecated_call(match=r"DataModule property `test_transforms` was deprecated in v1.5"):
+        dm.test_transforms = "c"
+    with pytest.deprecated_call(match=r"DataModule property `train_transforms` was deprecated in v1.5"):
+        _ = LightningDataModule(train_transforms="a")
+    with pytest.deprecated_call(match=r"DataModule property `val_transforms` was deprecated in v1.5"):
+        _ = LightningDataModule(val_transforms="b")
+    with pytest.deprecated_call(match=r"DataModule property `test_transforms` was deprecated in v1.5"):
+        _ = LightningDataModule(test_transforms="c")
+    with pytest.deprecated_call(match=r"DataModule property `test_transforms` was deprecated in v1.5"):
+        _ = LightningDataModule(test_transforms="c", dims=(1, 1, 1))
+
+
+def test_v1_7_0_datamodule_size_property(tmpdir):
+    dm = MNISTDataModule()
+    with pytest.deprecated_call(match=r"DataModule property `size` was deprecated in v1.5"):
+        dm.size()
+
+
+def test_v1_7_0_datamodule_dims_property(tmpdir):
+    dm = MNISTDataModule()
+    with pytest.deprecated_call(match=r"DataModule property `dims` was deprecated in v1.5"):
+        _ = dm.dims
+    with pytest.deprecated_call(match=r"DataModule property `dims` was deprecated in v1.5"):
+        _ = LightningDataModule(dims=(1, 1, 1))