The Mahon Baronetcy, of Castlegar in the County of Galway, is a title in the Baronetage of the United Kingdom. It was created on 14 April 1819 for Ross Mahon, Member of Parliament for Ennis in 1820. The family surname is pronounced "Mahn".
The heir apparent to the baronetcy is James William Mahon (born 1976), only son of the 7th Baronet.