William Mills (1701-1750) was a British stage actor. The son of veteran stage actor John Mills and his wife Margaret Mills, he was born in London and baptised at St Martin-in-the-Fields on 29 June 1701. Under his father's guidance he made his debut as a child actor in 1712. He was married to the actress until her death in 1733, after which he married another actress Elizabeth Holliday. With his first wife he had a daughter also called Theodosia who likewise became an actress.