Murder in Three Acts is a British-American made-for-television mystery film of 1986 produced by Warner Bros. Television, featuring Peter Ustinov as Agatha Christie's detective Hercule Poirot. Directed by Gary Nelson, it co-starred Jonathan Cecil as Hastings, Tony Curtis, and Emma Samms.

The film is based on Christie's book Three Act Tragedy (1934), published in the US under the title Murder in Three Acts. It was Ustinov's third and last portrayal of Poirot on television, and sixth overall including the feature films that preceded the TV movies.