Windsor Davies (born August 28, 1930) is an English-born Welsh actor.
Davies was born in Canning Town, London to Welsh parents, and he returned to his parents' native Rhondda Valley when the Second World War began, in 1940.
He became well known for playing the part of Battery Sergeant Major Williams in the 1970s British sitcom It Ain't Half Hot Mum. His catchphrase on the show was "Shut Up!" delivered with an ear drum shattering military scream. As a spin-off from the series, Davies and his co-star, Don Estelle had a number one hit in the UK with a semi-comic version of Whispering Grass. He played major roles in two later Carry On films, Behind in 1975 and England in 1976. He later re-established himself as a sitcom actor with the role of antique dealer Oliver Smallbridge in Never the Twain, alongside Donald Sinden.
He is also known for providing the voice of Sergeant Major Zero in the Terrahawks television series; and appeared in the Doctor Who story The Evil of the Daleks in 1967.