The Clandeboye Estate is a country estate in Bangor, County Down, Northern Ireland, 12 miles (19 km) outside Belfast. Covering 2,000 acres (8.1 km2), it contains woodlands, formal and walled gardens, lawns, a lake, and 250 hectares of farmland. Named after the former Gaelic territory of Clandeboye, the estate was the home of Lindy, Marchioness of Dufferin and Ava, widow of the last Marquess, until her death in October 2020.

Helen Selina Blackwood, Baroness Dufferin and Claneboye, later Countess of Gifford, was an Irish songwriter, composer, poet, and author. Admired for her wit and literary talents, she was a well-known figure in London society of the mid-19th century.