John Callahan can refer to:

• John Callahan (actor), best known from the popular soap opera All My Children

• John Callahan (cartoonist), the cartoonist.

• John Callahan's Quads!, a 2001 animated television series.
• John Callahan's Pelswick, a 2000 animated television series.

• John B. Callahan, mayor of Bethlehem, Pennsylvania.
• 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 Ross Callahan, (1853-1918), pioneer in the field of dentistry and particularly dental research.

This disambiguation page lists articles associated with the same personal name. If an internal link led you here, you may wish to change the link to point directly to the intended article.