William Barrett

William Barrett may refer to:


 * 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