diff --git a/buzz/locale.py b/buzz/locale.py
index 299e03067..43f923b73 100644
--- a/buzz/locale.py
+++ b/buzz/locale.py
@@ -1,3 +1,4 @@
+import os
 import logging
 import gettext
 
@@ -9,10 +10,14 @@
 locale_dir = get_path("locale")
 gettext.bindtextdomain("buzz", locale_dir)
 
-logging.debug(f"UI locales {QLocale().uiLanguages()}")
+custom_locale = os.getenv("BUZZ_LOCALE")
+
+languages = [custom_locale] if custom_locale else QLocale().uiLanguages()
+
+logging.debug(f"UI locales {languages}")
 
 translate = gettext.translation(
-    APP_NAME.lower(), locale_dir, languages=QLocale().uiLanguages(), fallback=True
+    APP_NAME.lower(), locale_dir, languages=languages, fallback=True
 )
 
 _ = translate.gettext
diff --git a/docs/docs/preferences.md b/docs/docs/preferences.md
index 05386dc63..2adc80bac 100644
--- a/docs/docs/preferences.md
+++ b/docs/docs/preferences.md
@@ -90,3 +90,5 @@ combined to produce the final answer.
 Defaults to [user_cache_dir](https://pypi.org/project/platformdirs/).
 
 **BUZZ_FAVORITE_LANGUAGES** - Coma separated list of supported language codes to show on top of language list.
+
+**BUZZ_LOCALE** - Buzz UI locale to use. Defaults to one of supported system locales.