diff --git a/pandas/core/groupby/ops.py b/pandas/core/groupby/ops.py
index 3c4a22d009406..71525c8c1a223 100644
--- a/pandas/core/groupby/ops.py
+++ b/pandas/core/groupby/ops.py
@@ -996,9 +996,6 @@ def groups(self):
         }
         return result
 
-    def __iter__(self) -> Iterator[Hashable]:
-        return iter(self.groupings[0].grouping_vector)
-
     @property
     def nkeys(self) -> int:
         # still matches len(self.groupings), but we can hard-code