diff --git a/lib/matplotlib/figure.py b/lib/matplotlib/figure.py
index 1636e201019b..92377bd690ed 100644
--- a/lib/matplotlib/figure.py
+++ b/lib/matplotlib/figure.py
@@ -878,8 +878,7 @@ def subplots(self, nrows=1, ncols=1, *, sharex=False, sharey=False,
# Note that this is the same as
fig.subplots(2, 2, sharex=True, sharey=True)
"""
- if gridspec_kw is None:
- gridspec_kw = {}
+ gridspec_kw = dict(gridspec_kw or {})
if height_ratios is not None:
if 'height_ratios' in gridspec_kw:
raise ValueError("'height_ratios' must not be defined both as "
@@ -1869,7 +1868,7 @@ def subplot_mosaic(self, mosaic, *, sharex=False, sharey=False,
"""
subplot_kw = subplot_kw or {}
- gridspec_kw = gridspec_kw or {}
+ gridspec_kw = dict(gridspec_kw or {})
if height_ratios is not None:
if 'height_ratios' in gridspec_kw:
raise ValueError("'height_ratios' must not be defined both as "
diff --git a/lib/matplotlib/tests/test_figure.py b/lib/matplotlib/tests/test_figure.py
index 48b4a880e089..cc5a3b9ae2ff 100644
--- a/lib/matplotlib/tests/test_figure.py
+++ b/lib/matplotlib/tests/test_figure.py
@@ -1412,3 +1412,11 @@ def test_unpickle_with_device_pixel_ratio():
assert fig.dpi == 42*7
fig2 = pickle.loads(pickle.dumps(fig))
assert fig2.dpi == 42
+
+
+def test_gridspec_no_mutate_input():
+ gs = {'left': .1}
+ gs_orig = dict(gs)
+ plt.subplots(1, 2, width_ratios=[1, 2], gridspec_kw=gs)
+ assert gs == gs_orig
+ plt.subplot_mosaic('AB', width_ratios=[1, 2], gridspec_kw=gs)
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