Cowper (pronounced Cowper or Cooper depending on family) is a surname of several persons:
Austen Cowper (1885–1960), cricketerBob Cowper (born 1940), Australian cricketerCharles Cowper (1807–1875), Australian politicianDouglas Cowper (1817–1839), British painterEdward Alfred Cowper (1819–1893), British mechanical engineer and metallurgistFrancis Thomas de Grey Cowper, 7th Earl CowperFrank Cowper (1849–1930), British yachtsman and author; father of artist Frank Cadogan CowperFrank Cadogan Cowper (1877–1958), British artistGerry Cowper (born 1958), British actressMary Cowper (1625–1784), British courtier and diaristNicola Cowper (born 1967), British actressPeter Cowper (1902–1962), English footballer of the 1920s and 1930sRichard Cowper, pseudonym of John Middleton Murry, Jr.Spencer Cowper (1670–1728), British MP and barristerSpencer Cowper (priest) 1713–1774, Dean of Durham CathedralSteve Camberling Cowper (born 1938), American politician and governor of AlaskaWilliam Cowper of Galloway (1568–1619), bishopWilliam Cowper (1731–1800), English poet and hymnodistWilliam Cowper, 1st Earl Cowper (1665–1723), Lord Chancellor of EnglandWilliam Cowper (anatomist), English anatomist (1666–1709), see also Cowper's gland and Cowper's fluidWilliam Cowper-Temple, 1st Baron Mount Temple (1811–1888), British politician and courtier