diff --git a/changelogs/unreleased/FixLocaleEN.yml b/changelogs/unreleased/FixLocaleEN.yml
new file mode 100644
index 00000000000..49738a6d127
--- /dev/null
+++ b/changelogs/unreleased/FixLocaleEN.yml
@@ -0,0 +1,5 @@
+---
+title: Remove duplicated mapping key in config/locales/en.yml
+merge_request: 30980
+author: Peter Dave Hello
+type: fixed
diff --git a/config/locales/en.yml b/config/locales/en.yml
index a3dceb2fb62..a60f86e1d80 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -16,12 +16,6 @@ en:
         api_url: "Sentry API URL"
       project/metrics_setting:
         external_dashboard_url: "External dashboard URL"
-  errors:
-    messages:
-      label_already_exists_at_group_level: "already exists at group level for %{group}. Please choose another one."
-      wrong_size: "is the wrong size (should be %{file_size})"
-      size_too_small: "is too small (should be at least %{file_size})"
-      size_too_big: "is too big (should be at most %{file_size})"
   views:
     pagination:
       previous: "Prev"