John Callahan
John Callahan may refer to:
- John Callahan , American actor; best known from the soap opera All My Children
- John Callahan , cartoonist
- John Callahan , Wisconsin Superintendent of Public Instruction
- John B. Callahan, mayor of Bethlehem, Pennsylvania and Democratic nominee for the U.S. House of Representatives
- John F. Callahan, writer and editor of numerous volumes related to African-American literature
- John H. Callahan, American Civil War soldier and Medal of Honor recipient
- John M. Callahan, chairman of the Democratic Party of Wisconsin
- John Ross Callahan, American dentist
- John Callahan , American baseball player
- John Callahan , baseball player
- John Callahan , American Olympic skier
- John Callahan , American professional wrestler
- John Callahan , American outlaw and bank robber