Thornber is a surname. Notable people with the surname include:
Catherine Thornber (c. 1813–1894), Australian headmistress Harry Thornber (1851–1913), British cricketer Kraig Thornber (born 1961), British actor, singer and choreographer Richard Thornber (1867–1911), British footballer Steve Thornber (born 1965), British footballer William Thornber (1803–1885), British minister and historian