diff --git a/changelogs/fragments/992-nmcli-locale.yml b/changelogs/fragments/992-nmcli-locale.yml
new file mode 100644
index 0000000000..599d795b12
--- /dev/null
+++ b/changelogs/fragments/992-nmcli-locale.yml
@@ -0,0 +1,2 @@
+bugfixes:
+- "nmcli - set ``C`` locale when executing ``nmcli`` (https://github.com/ansible-collections/community.general/issues/989)."
diff --git a/plugins/modules/net_tools/nmcli.py b/plugins/modules/net_tools/nmcli.py
index f00befaed5..77893e6d4f 100644
--- a/plugins/modules/net_tools/nmcli.py
+++ b/plugins/modules/net_tools/nmcli.py
@@ -1760,6 +1760,7 @@ def main():
         ),
         supports_check_mode=True,
     )
+    module.run_command_environ_update = dict(LANG='C', LC_ALL='C', LC_MESSAGES='C', LC_CTYPE='C')
 
     if not HAVE_DBUS:
         module.fail_json(msg=missing_required_lib('dbus'), exception=DBUS_IMP_ERR)