diff --git a/pandas/core/algorithms.py b/pandas/core/algorithms.py
index df9f3d07ce7fd..c0ed515b6640a 100644
--- a/pandas/core/algorithms.py
+++ b/pandas/core/algorithms.py
@@ -903,14 +903,15 @@ def value_counts_arraylike(values, dropna: bool):
 
 
 def duplicated(
-    values: ArrayLike, keep: Literal["first", "last", False] = "first"
+    values: AnyArrayLike,
+    keep: Literal["first", "last", False] = "first",
 ) -> np.ndarray:
     """
     Return boolean ndarray denoting duplicate values.
 
     Parameters
     ----------
-    values : nd.array, ExtensionArray or Series
+    values : nd.array, ExtensionArray, Series or Index
         Array over which to check for duplicate values.
     keep : {'first', 'last', False}, default 'first'
         - ``first`` : Mark duplicates as ``True`` except for the first