John Cahill

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 (businessman), British businessman, and former Executive Chairman of British Aerospace
 * John Cahill (bishop), Roman Catholic Bishop of Portsmouth
 * John T. Cahill (lawyer), American lawyer and prosecutor
 * John T. Cahill (businessman), American businessman
 * John Joseph Cahill, Premier of New South Wales from 1952 to 1959
 * John Cahill (wrestler), American professional wrestler