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