Somebody Knows is a 1932 mystery play by the British writer John Van Druten about an entertainer who is accused of strangling a prostitute. Following a court case there is not enough evidence to convict him, leaving the audience unsure of his actual guilt.^[1]

It was staged at St Martin's Theatre in the West End, running for 43 performances between 12 May and 18 June 1932. The cast included Frank Lawton, Lawrence Hanray, Enid Stamp-Taylor and Cathleen Nesbitt.^[2]

It was comparatively unsuccessful at a time when many of Van Druten's work's were enjoying commercial success. He attributed this to the fact that audiences expected a standard whodunnit while he was interested in developing a character study.^[3]