William Barrett may refer to:
William Barrett II (1754-1840), North Carolina Revolutionary War Captain, sheriff, and politician W. S. Barrett (1914–2001), English classical scholar William Barrett (antiquarian) (1733–1789), English antiquary and surgeon William Barrett (consul) (died 1584), English consul William Barrett (philosopher) (1913–1992), American philosopher and professor William Barrett (priest) (1880–1956), British–Australian Anglican Dean of Brisbane William A. Barrett (1896–1976), American lawyer and politician William Edmund Barrett (1900–1986), American writer William Emerson Barrett (1858–1906), American journalist and politician William F. Barrett (1844–1925), English physicist William H. Barrett (1866–1941), American federal judge William Lewis Barrett (1847–1927), English flautist and music teacher William N. Barrett (1855–1916), American politician
See also Bill Barrett (disambiguation) William Barratt (1823–1889), English convert to Mormonism William Barratt (manufacturer) (1877–1939), British shoe manufacturer William Cross Barratt (1862–1940), British Army and British Indian Army officer William Barret ( 1579–1595), English divine William Barret (died 1871), American businessman William E. Berrett (1902–1993), writer and educator