diff --git a/oslo_concurrency/processutils.py b/oslo_concurrency/processutils.py
index dea5b7a..458e3e6 100644
--- a/oslo_concurrency/processutils.py
+++ b/oslo_concurrency/processutils.py
@@ -26,6 +26,7 @@ import shlex
 import signal
 import sys
 import time
+import warnings
 
 import enum
 from oslo_utils import encodeutils
@@ -36,6 +37,11 @@ from oslo_utils import timeutils
 from oslo_concurrency._i18n import _
 
 
+if os.name == 'nt':
+    warnings.warn('Support for Windows OS is deprecated.',
+                  category=DeprecationWarning, stacklevel=3)
+
+
 # NOTE(bnemec): eventlet doesn't monkey patch subprocess, so we need to
 # determine the proper subprocess module to use ourselves.  I'm using the
 # time module as the check because that's a monkey patched module we use
diff --git a/releasenotes/notes/deprecate-windows-support-fcb77dddf82de36b.yaml b/releasenotes/notes/deprecate-windows-support-fcb77dddf82de36b.yaml
new file mode 100644
index 0000000..cba3205
--- /dev/null
+++ b/releasenotes/notes/deprecate-windows-support-fcb77dddf82de36b.yaml
@@ -0,0 +1,4 @@
+---
+deprecations:
+  - |
+    Support for Windows operating systems has been deprecated.