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
See also
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