Alfred Deller (31 May 1912 – 16 July 1979) was an English singer, one of the main figures in popularising the use of the countertenor voice in renaissance and baroque music. Deller was born in Margate, and as a boy sang in his local church choir. When his voice broke, he continued singing in his high register, eventually settling as a countertenor. Throughout the 19th century, it was only in the tradition of all-male cathedral choirs that the countertenor voice had survived. Deller was himself successively a member of the choirs of Canterbury and St Paul's Cathedrals.