The Lost Hours (also known as The Big Frame) is a 1952 British second feature ('B') film noir directed by David MacDonald and starring Mark Stevens, Jean Kent and John Bentley. It was written by Steve Fisher and John Gilling. It was produced by Tempean Films which specialised in making second features at the time, and marked Kent's first "descent", as Chibnall and McFarlane put it, into B films after her 1940s stardom. It was released in the United States in 1953 by RKO Pictures.