John Callahan may refer to: John Callahan (actor) (born 1953), best known from the popular soap opera All My Children John Callahan (cartoonist) (1951–2010), cartoonistJohn Callahan's Quads!, a 2001 animated television seriesJohn Callahan (Wisconsin politician) (1865–1956), Wisconsin Superintendent of Public Instruction John B. Callahan (born 1969), 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 (1845–1914), American Civil War soldier and Medal of Honor recipient John M. Callahan, chairman of the Democratic Party of Wisconsin John Ross Callahan (1853–1918), American dentist John Callahan (catcher) (1878–1952), American baseball player John Callahan (pitcher) (1874–1954), baseball player John Callahan (wrestler) (born 1964), American professional wrestler John Callahan (outlaw) (1866–1936), American outlaw and bank robber