diff --git a/changelogs/fragments/11787-group5-batch16-locale.yml b/changelogs/fragments/11787-group5-batch16-locale.yml
new file mode 100644
index 0000000000..56e78013e2
--- /dev/null
+++ b/changelogs/fragments/11787-group5-batch16-locale.yml
@@ -0,0 +1,2 @@
+bugfixes:
+  - btrfs module_utils - set ``LANGUAGE`` and ``LC_ALL`` environment variables to ``C`` in all ``run_command()`` calls (https://github.com/ansible-collections/community.general/issues/11737, https://github.com/ansible-collections/community.general/pull/11787).
diff --git a/plugins/module_utils/btrfs.py b/plugins/module_utils/btrfs.py
index 6b7d7691e0..fe2cc01c89 100644
--- a/plugins/module_utils/btrfs.py
+++ b/plugins/module_utils/btrfs.py
@@ -35,6 +35,7 @@ class BtrfsCommands:
 
     def __init__(self, module: AnsibleModule) -> None:
         self.__module = module
+        self.__module.run_command_environ_update = {"LANGUAGE": "C", "LC_ALL": "C"}
         self.__btrfs: str = self.__module.get_bin_path("btrfs", required=True)
 
     def filesystem_show(self) -> list[dict[str, t.Any]]: