diff --git a/doc/api/next_api_changes/deprecations/21126-TH.rst b/doc/api/next_api_changes/deprecations/21126-TH.rst
new file mode 100644
index 000000000000..43df16287319
--- /dev/null
+++ b/doc/api/next_api_changes/deprecations/21126-TH.rst
@@ -0,0 +1,2 @@
+Passing formatting parameters positionally to ``stem()`` is deprecated
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
index 3856e45229fc..e8614e07ebed 100644
--- a/lib/matplotlib/axes/_axes.py
+++ b/lib/matplotlib/axes/_axes.py
@@ -2849,6 +2849,12 @@ def stem(self, *args, linefmt=None, markerfmt=None, basefmt=None, bottom=0,
args = ()
else:
locs, heads, *args = args
+ if args:
+ _api.warn_deprecated(
+ "3.5",
+ message="Passing the linefmt parameter positionally is "
+ "deprecated since Matplotlib %(since)s; the "
+ "parameter will become keyword-only %(removal)s.")
if orientation == 'vertical':
locs, heads = self._process_unit_info([("x", locs), ("y", heads)])
diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
index e96f9d5605d6..b1d6dae02d4f 100644
--- a/lib/matplotlib/tests/test_axes.py
+++ b/lib/matplotlib/tests/test_axes.py
@@ -3641,8 +3641,8 @@ def test_stem_args():
# Test the call signatures
ax.stem(y)
ax.stem(x, y)
- ax.stem(x, y, 'r--')
- ax.stem(x, y, 'r--', basefmt='b--')
+ ax.stem(x, y, linefmt='r--')
+ ax.stem(x, y, linefmt='r--', basefmt='b--')
def test_stem_dates():
@@ -3650,7 +3650,7 @@ def test_stem_dates():
xs = [dateutil.parser.parse("2013-9-28 11:00:00"),
dateutil.parser.parse("2013-9-28 12:00:00")]
ys = [100, 200]
- ax.stem(xs, ys, "*-")
+ ax.stem(xs, ys)
@pytest.mark.parametrize("use_line_collection", [True, False],
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