Allison Mansion, also known as Riverdale, is a historic home located on the campus of Marian University at Indianapolis, Marion County, Indiana.

It was built between 1911 and 1914, and is a large two-story, Arts and Crafts style red brick mansion with a red tile roof.

[2]: 2–4 The house was built by businessman and auto racing pioneer James A. Allison.

It was added to the National Register of Historic Places in 1970.

This article about a property in Marion County, Indiana on the National Register of Historic Places is a stub.