William Barrett may refer to:
- William Barrett (antiquarian) (1733–1789), English surgeon and antiquary
- William Barrett (consul) (died 1584), English consul at Aleppo
- William Barrett (philosopher) (1913–1992), American philosopher and critic
- William Barrett (priest) (1880–1956), British-Australian Anglican Dean of Brisbane
- William A. Barrett (1896–1976), American politician and a member of the Democratic Party
- William E. Barrett (born 1929), former US Representative from Nebraska
- William Edmund Barrett (1900–1986), writer
- William Emerson Barrett (1858–1906), Representative from Massachusetts
- William Fletcher Barrett (1844–1925), English physicist
- William Hale Barrett (1866–1941), American federal judge
- William N. Barrett (1855–1916), American politician
- William Daniel Barrett (1878–1953), New Zealand tribal leader, land court agent and trust board secretary
Famous quotes containing the word barrett:
“What is genius—but the power of expressing a new individuality?”
—Elizabeth Barrett Browning (1806–1861)