Cosby is a surname. Notable people with the surname include:
Alexander Cosby (1685–1742), Irish military officer Andrew Cosby (born 1968), American comic book creator, film producer, and screenwriter Bill Cosby (born 1937), American actor, comedian, and alleged sex offender Bryce Cosby (born 1999), American football player Camille Cosby (born 1944), American author and wife of Bill Cosby Dabney Cosby (1793–1862), American architect and builder Dudley Cosby, 1st Baron Sydney (1730–1774), Irish politician and diplomat Ennis Cosby (1969–1997), American student and son of Bill Cosby who was murdered in 1997 Erika Cosby (born 1965), artist and daughter of Bill Cosby Francis Cosby (1510–1580), English soldier and settler in Ireland George B. Cosby (1830–1909), Confederate States Army officer Gerry Cosby (1909–1996), American ice hockey player and businessman Henry Cosby (1928–2002), American songwriter and record producer Jessica Cosby (born 1982), American hammer thrower Joseph Hathaway Cosby (1902–1998), American pastor, US Army chaplain, and the second President of Hargrave Military Academy Mary Cosby (born 1972), American television personality Phillips Cosby (1729–1808), Royal Navy officer Quan Cosby (born 1982), American football player Rita Cosby (born 1964), TV reporter S. A. Cosby (1973) – American author William Cosby (1690–1736), British nobleman and governor of the New York Colony Vivian Cosby (1901–1963), American playwright
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Crosby Crosbie