William Barrett
William Barrett is the name of the following people:
- William Barrett (philosopher) (1913–1992), American philosopher
- William Barrett (swimmer) , American swimmer
- William A. Barrett (1896–1976), American politician
- William E. Barrett (1900–1986), American writer
- William Emerson Barrett (1858–1906), American politician
- William F. Barrett (1844–1925), English physicist
- William Spencer Barrett (1914-2001), British classical philologist