John Cahill may refer to: John Cahill (baseball), former Major League Baseball outfielder John Cahill (footballer), retired Australian rules football player and coach John Cahill, CEO of social network service Meez John Cahill (businessman), British businessman, and former Executive Chairman of British Aerospace John P. Cahill, former Secretary and Chief of Staff to New York Governor George E. Pataki John Cahill (bishop), Roman Catholic Bishop of Portsmouth John T. Cahill, American lawyer and prosecutor John T. Cahill (businessman), American businessman John Joseph Cahill, Premier of New South Wales from 1952 to 1959 John Cahill (financier), New York socialite and friend of Anne Slater, see International Best Dressed List John Cahill (wrestler), American professional wrestler