diff --git a/doc/api/next_api_changes/removals.rst b/doc/api/next_api_changes/removals.rst
index 8c41ada50790..3d36e452625e 100644
--- a/doc/api/next_api_changes/removals.rst
+++ b/doc/api/next_api_changes/removals.rst
@@ -2,6 +2,11 @@ Removals
 --------
 The following deprecated APIs have been removed:
 
+Modules
+~~~~~~~
+- ``backends.qt_editor.formlayout`` (use the formlayout module available on
+  PyPI instead).
+
 Classes and methods
 ~~~~~~~~~~~~~~~~~~~
 - ``backend_bases.RendererBase.strip_math()``
@@ -126,3 +131,7 @@ rcParams
   :rc:`savefig.facecolor` to "none" to get a transparent background.
 - The ``pgf.debug``, ``verbose.fileo`` and ``verbose.verbose.level`` rcParams,
   which had no effect, have been removed.
+
+Environment variables
+~~~~~~~~~~~~~~~~~~~~~
+- ``MATPLOTLIBDATA`` (no replacement).
diff --git a/lib/matplotlib/__init__.py b/lib/matplotlib/__init__.py
index 323794f0632c..ff6e46975d10 100644
--- a/lib/matplotlib/__init__.py
+++ b/lib/matplotlib/__init__.py
@@ -510,15 +510,6 @@ def get_cachedir():
 def _get_data_path():
     """Return the path to matplotlib data."""
 
-    if 'MATPLOTLIBDATA' in os.environ:
-        path = os.environ['MATPLOTLIBDATA']
-        if not os.path.isdir(path):
-            raise RuntimeError('Path in environment MATPLOTLIBDATA not a '
-                               'directory')
-        cbook.warn_deprecated(
-            "3.1", name="MATPLOTLIBDATA", obj_type="environment variable")
-        return path
-
     path = Path(__file__).with_name("mpl-data")
     if path.is_dir():
         return str(path)
diff --git a/lib/matplotlib/backends/qt_editor/formlayout.py b/lib/matplotlib/backends/qt_editor/formlayout.py
deleted file mode 100644
index a6c3f75ee167..000000000000
--- a/lib/matplotlib/backends/qt_editor/formlayout.py
+++ /dev/null
@@ -1,7 +0,0 @@
-from .. import cbook
-from ._formlayout import *
-
-
-cbook.warn_deprecated(
-    "3.1", name=__name__, obj_type="module",
-    alternative="the formlayout module available on PyPI")