William Cowper can refer to
William Cowper (1731–1800), English poet and hymnodist William Cowper (doctor) (1701–1767) English doctor and antiquarian William Cowper (anatomist) (1666–1709), English anatomist; eponym of Cowper's gland and Cowper's fluid William Couper (bishop) (1568–1619), Scottish bishop William Cowper, 1st Earl Cowper (c. 1665–1723), Lord Chancellor of England William Cowper (Archdeacon of Cumberland) (1778–1858), Anglican priest in Australia, father of the below William Cowper (Dean of Sydney) (1810–1902), Anglican priest in Australia, son of the above William Cowper-Temple, 1st Baron Mount Temple (1811–1888), British politician and courtier William Cowper (1853–1918), British stage and film actor
See also Cowper (surname)