Her story was turned into a movie

Film and television have both adapted Christie's novels. The first was The Passing of Mr. Quinn, a 1928 British motion picture. Austin Trevor was Christie's boss in the 1931 picture Alibi, which also included Poirot in a supporting role. In several 1960s movies, Margaret Rutherford played Marple. Christie praised her acting, but she thought the first movie was "very terrible" and wasn't much better than the others.

She had various opinions on the Sidney Lumet film Murder on the Orient Express (1974), which starred major names and had high production values. Her appearance at the London premiere was one of her final public appearances. In 2016, a brand-new motion picture adaptation was released, with Kenneth Branagh directing and also starring, and sporting "the most magnificent mustache spectators have ever seen."

With David Suchet playing the title character, the television adaptation of Agatha Christie's Poirot aired for 70 episodes across 13 series from 1989 to 2013. In the years 1990 to 1992, it was nominated for nine BAFTA Awards and took home four of them. All 12 of Marple's novels were made popular by the television series Miss Marple (1984–1992) starring Joan Hickson as "BBC's peerless Miss Marple." The French television series Les Petits Meurtres d'Agatha Christie (2009–2012, 2013–2020), adapted 36 stories by Christie.