Ringmahon House

Ringmahon House is a 19th-century house in the Mahon and Blackrock area of Cork in Ireland. Built c.1820 by James Murphy (of Murphy's Brewery), the house was owned by Ben Dunne (of Dunnes Stores) in the mid-20th century. As of the 21st century, the house is owned by Cork City Council and is used as a school by Mahon Youthreach.

The grounds of Ringmahon House contain the former gate tower of an earlier castle. The remains of this structure, known as Ringmahon Castle, are included in the Record of Protected Structures maintained by Cork City Council.