Another Man's Poison is a 1951 British drama film directed by Irving Rapper and starring Bette Davis, Gary Merrill and Emlyn Williams.

Successful mystery novelist Janet Frobisher, who has been separated for years from her husband, a man with a criminal past, lives in an isolated home in Northern England.

When her estranged husband unexpectedly appears, Janet poisons him by administering medication given to her by Dr Henderson for her horse.

Gary Merrill, as her assumed husband, turns in an impressive performance, being strong without being domineering, tough without being brutal.

Emlyn Williams, a little more suave than usual, plays a neighbor vet who knows there is something wrong and whose nosiness exposes the masquerade.

Anthony Steel and Barbara Murray are a good romantic team, while Reginald Beckwith and Edna Morris fill the two minor roles with polish.

"[13] The New York Times described the film as "a garrulous but occasionally interesting excursion into murder and unrequited love ... the script ... is basically a static affair that rarely escapes from its sets or the scenarist's verbosity.

Suspense is only fitfully generated and then quickly dissipated ...Gary Merrill contributes a thoroughly seasoned and convincing portrayal ... Emlyn Williams adds a professionally polished characterization ... and Anthony Steel and Barbara Murray are adequate ...

She is permitted a wide latitude of histrionics in delineating the designing neurotic who is as flinty a killer as any we've seen in the recent past.

"[14] In his review in New Statesman and Nation, Frank Hauser wrote "No one has ever accused Bette Davis of failing to rise to a good script; what this film shows is how far she can go to meet a bad one.