Bill 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 J. Callahan, 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, American Roman Catholic bishop
William R. Callahan (priest) (1931–2010), American Roman Catholic priest
William R. Callahan (1925–1976), Massachusetts state representative
William Roger Callahan (1931–2022), journalist and politician in Newfoundland, Canada
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