Still Waters is a 1949 detective novel by E. C. R. Lorac, the pen name of the British writer Edith Caroline Rivett. It is the thirty second in her long-running series featuring Chief Inspector MacDonald of Scotland Yard, one of the more orthodox detectives of the Golden Age of Detective Fiction.
It was one of several novels Lorac set in the Lancashire fell country around Lunesdale where she spent much of her time. It follows a woman who buys a farm near a former quarry and begins experiencing a series of strange events, and it seems she may be the victim of other potential owners of the farm who linger in the area.