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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 J. Callahan (Secret Service), Deputy Director of the United States Secret Service
William J. Callahan, candidate in the 1936 United States Senate election in New Hampshire
William P. Callahan (born 1950), American Roman Catholic bishop
William R. Callahan (priest) (1931–2010), American Roman Catholic priest
William R. Callahan (state representative) (1925–1976), Massachusetts state representative
William Roger Callahan (1931–2022), journalist and politician in Newfoundland, Canada
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
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