diff --git a/spec/API_specification/dataframe_api/column_object.py b/spec/API_specification/dataframe_api/column_object.py
index b3e10738..199f91d8 100644
--- a/spec/API_specification/dataframe_api/column_object.py
+++ b/spec/API_specification/dataframe_api/column_object.py
@@ -1057,3 +1057,13 @@ def persist(self) -> Self:
             at most once per dataframe, and as late as possible in the pipeline.
         """
         ...
+
+    def cast(self, dtype: DType) -> Self:
+        """Cast specified columns to specified dtypes.
+
+        The following is not specified and may vary across implementations:
+
+        - Cross-kind casting (e.g. integer to string, or to float)
+        - Behaviour in the case of overflows
+        """
+        ...
diff --git a/spec/API_specification/dataframe_api/dataframe_object.py b/spec/API_specification/dataframe_api/dataframe_object.py
index 4e423fd2..6255402b 100644
--- a/spec/API_specification/dataframe_api/dataframe_object.py
+++ b/spec/API_specification/dataframe_api/dataframe_object.py
@@ -925,3 +925,13 @@ def persist(self) -> Self:
                         features.append(column_name)
         """
         ...
+
+    def cast(self, dtypes: Mapping[str, DType]) -> Self:
+        """Convert specified columns to specified dtypes.
+
+        The following is not specified and may vary across implementations:
+
+        - Cross-kind casting (e.g. integer to string, or to float)
+        - Behaviour in the case of overflows
+        """
+        ...