John Callahan

• Jack Callahan (disambiguation)
• John B. Callahan
• John Callaghan (disambiguation)
• John Callahan (Wisconsin politician)
• John Callahan (actor)
• John Callahan (cartoonist)
• John Callahan (catcher)
• John Callahan (outlaw)
• John Callahan (pitcher)
• John Callahan (skier)
• John Callahan (wrestler)
• John F. Callahan
• John H. Callahan
• John M. Callahan
• John Ross Callahan