John Eric Drummond, 9th Earl of Perth (born 7 July 1935) the son of John David Drummond who in 1951 became the 8th Earl of Perth, and his wife Nancy Seymour Fincke, an American with roots in colonial British North America. He is also known as the titular (Jacobite) 15th Duke of Perth, 14th Viscount of Strathallan. He succeeded to the titles of 18th de jure Earl of Perth, 12th Lord Drummond of Cromlix, 14th Lord Maderty and 22nd Lord Drummond on 25 November 2002.
On 7 January 1963 he married Margaret Anne Gordon, daughter of Robin Gordon. They had three children before divorcing in 1972. He married secondly in 1988 Mrs. Marion Verity Grey Elliot, née Eton.
When his father died in 2002, he became the Earl of Perth.