Obsession, released in the United States as The Hidden Room, is a 1949 British crime film directed by Edward Dmytryk. It is based on the 1947 novel A Man About a Dog by Alec Coppel, who also wrote the screenplay for the film. Obsession was entered into the 1949 Cannes Film Festival.

Naunton Wayne, was a Welsh character actor, born in Pontypridd, Glamorgan, Wales. He was educated at Clifton College. His name was changed by deed poll in 1933.