William Callahan
# William Callahan

William Callahan may refer to:

* William A. Callahan, Canadian political scientist
* William F. Callahan (1891–1964), chairman of the Massachusetts Turnpike Authority
   * Callahan Tunnel or William F. Callahan Tunnel, a Boston Harbor tunnel
* William P. Callahan (born 1950), American Roman Catholic bishop
* William R. Callahan (state representative) (1925–1976), Massachusetts state representative
* William R. Callahan (priest) (1931–2010), American Roman Catholic priest
* William Roger Callahan (1931–2022), journalist and politician in Newfoundland, Canada
* William J. Callahan, Deputy Director of the United States Secret Service

Bill Callahan may refer to:

* Bill Callahan (American football) (born 1956), American football coach
* Bill Callahan (defensive back) (born 1964), American football player
* Bill Callahan (musician) (born 1966), American singer-songwriter
* Bill Callahan (TV producer), former producer and writer for Scrubs
