The Thorndike Theatre, now known as the Leatherhead Theatre, is a Grade II listed building in Leatherhead, Surrey, England. Roderick Ham designed the theatre within the shell of the disused 1930s Crescent Cinema. Named after Dame Sybil Thorndike, the theatre was opened on 17 September 1969 by Princess Margaret.

Dame Agnes Sybil Thorndike, Lady Casson, was an English actress whose stage career lasted from 1904 to 1969.