diff --git a/doc/api/next_api_changes/deprecations/20063-AL.rst b/doc/api/next_api_changes/deprecations/20063-AL.rst
new file mode 100644
index 000000000000..1811896119ba
--- /dev/null
+++ b/doc/api/next_api_changes/deprecations/20063-AL.rst
@@ -0,0 +1,4 @@
+``Divider.get_vsize_hsize`` and ``Grid.get_vsize_hsize``
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+These ``axes_grid1`` methods are deprecated.  Copy their implementations if
+needed.
diff --git a/lib/mpl_toolkits/axes_grid1/axes_divider.py b/lib/mpl_toolkits/axes_grid1/axes_divider.py
index b50bb5ccdeac..cbdd57e7203e 100644
--- a/lib/mpl_toolkits/axes_grid1/axes_divider.py
+++ b/lib/mpl_toolkits/axes_grid1/axes_divider.py
@@ -58,6 +58,7 @@ def get_horizontal_sizes(self, renderer):
     def get_vertical_sizes(self, renderer):
         return [s.get_size(renderer) for s in self.get_vertical()]
 
+    @_api.deprecated("3.5")
     def get_vsize_hsize(self):
         vsize = Size.AddList(self.get_vertical())
         hsize = Size.AddList(self.get_horizontal())
diff --git a/lib/mpl_toolkits/axes_grid1/axes_grid.py b/lib/mpl_toolkits/axes_grid1/axes_grid.py
index 295a03ec801f..4ffd1798ac7d 100644
--- a/lib/mpl_toolkits/axes_grid1/axes_grid.py
+++ b/lib/mpl_toolkits/axes_grid1/axes_grid.py
@@ -326,6 +326,7 @@ def set_axes_locator(self, locator):
     def get_axes_locator(self):
         return self._divider.get_locator()
 
+    @_api.deprecated("3.5")
     def get_vsize_hsize(self):
         return self._divider.get_vsize_hsize()