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 (Meez), C.E.O of Meez.com, a popular virtual world
• John P. Cahill, former Secretary and Chief of Staff to New York Governor George E. Pataki
• John Baptist Cahill, Roman Catholic Bishop of Portsmouth
• 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