Archibald David Kennedy, 7th Marquess of Ailsa, OBE, DL (3 December 1925 – 7 April 1994) was a Scottish peer, the son of Angus Kennedy, 6th Marquess of Ailsa.
In early life, as David Kennedy, he worked as a steam locomotive fireman and, as Marquess, ran the Isle of Man Railway as lessee for the 1967–1971 seasons.