Poison Pen is a 1939 British drama film directed by Paul L. Stein and starring Flora Robson, Reginald Tate and Ann Todd. It was based on the 1937 play of the same title by Richard Llewellyn.

Dame Flora McKenzie Robson was a British actress and star of the theatrical stage and cinema, particularly renowned for her performances in plays demanding dramatic and emotional intensity. Her range extended from queens to murderesses.