John Callahan
John Callahan is the name of the following people:
- John Callahan (cartoonist) (1951-2010), American cartoonist and musician
- John Callahan (actor) (1953-2020), American actor
- John F. Callahan (Philologist) ( John Francis Callahan ; 1912–2003), American classical philologist
- John F. Callahan (literary scholar) (* 1940), American literary scholar and editor