diff --git a/python/cudf/cudf/core/series.py b/python/cudf/cudf/core/series.py
index d8c41235a3c..a910c5ac0dc 100644
--- a/python/cudf/cudf/core/series.py
+++ b/python/cudf/cudf/core/series.py
@@ -3282,6 +3282,11 @@ def merge(
         method="hash",
         suffixes=("_x", "_y"),
     ):
+        warnings.warn(
+            "Series.merge is deprecated and will be removed in a future "
+            "release. Use cudf.merge instead.",
+            FutureWarning,
+        )
         if left_on not in (self.name, None):
             raise ValueError(
                 "Series to other merge uses series name as key implicitly"