Thark is a farce by the English playwright Ben Travers. It was first given at the Aldwych Theatre, London, the fourth in the series of twelve Aldwych farces presented at the theatre by the actor-manager Tom Walls between 1923 and 1933. It starred the same cast members as many of the other Aldwych farces. The story concerns a reputedly haunted English country house. Investigators and frightened occupants of the house spend a tense night searching for the ghost.
The piece opened on 4 July 1927 and ran for nearly a year. Travers made a film adaptation, which Walls directed in 1932, with most of the leading members of the stage cast reprising their roles.
The actor-manager Tom Walls produced the series of Aldwych farces, nearly all written by Ben Travers, and starring himself and Ralph Lynn, who specialised in playing "silly ass" characters. Walls assembled a regular company of actors to fill the supporting roles, including Robertson Hare, who played a figure of put-upon respectability; Mary Brough in eccentric old lady roles; Ethel Coleridge as the severe voice of authority; Winifred Shotter as the sprightly young female lead; and the saturnine Gordon James.
Walls and his team had already enjoyed three substantial hits at the Aldwych, with It Pays to Advertise (1923), which had run for 598 performances; A Cuckoo in the Nest (1925, 376 performances); and Rookery Nook (1926, 409 performances).
Thark was Travers's third playscript for the company, and his first original plot, following two earlier adaptations from his novels. The play opened on 4 July 1927 and ran for 401 performances until 16 June 1928.