diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
index 9037674780e2..36a5f7e490a0 100644
--- a/lib/matplotlib/axes/_axes.py
+++ b/lib/matplotlib/axes/_axes.py
@@ -5,7 +5,6 @@
 import math
 import operator
 from numbers import Number
-import warnings
 
 import numpy as np
 from numpy import ma
diff --git a/lib/matplotlib/dviread.py b/lib/matplotlib/dviread.py
index c204c6c2362e..48ba9ca88856 100644
--- a/lib/matplotlib/dviread.py
+++ b/lib/matplotlib/dviread.py
@@ -1040,7 +1040,6 @@ def _fontfile(cls, suffix, texname):
 if __name__ == '__main__':
     from argparse import ArgumentParser
     import itertools
-    import sys
 
     parser = ArgumentParser()
     parser.add_argument("filename")
diff --git a/lib/matplotlib/patches.py b/lib/matplotlib/patches.py
index 19aff209369e..1bec00ab3e4a 100644
--- a/lib/matplotlib/patches.py
+++ b/lib/matplotlib/patches.py
@@ -3,7 +3,6 @@
 import math
 from numbers import Number
 import textwrap
-import warnings
 
 import numpy as np