Dekalog: Nine (Polish: Dekalog, dziewięć) is the ninth part of Dekalog, the drama series of films directed by Polish director Krzysztof Kieślowski for television, connected to the ninth imperative of the Ten Commandments: "Thou shalt not covet thy neighbor's wife".

A man who has become impotent (Piotr Machalica) discovers that his wife (Ewa Błaszczyk) has a lover. (A minor character in this film, a young singer with a heart condition, inspired Kieślowski's and Piesiewicz's next film, The Double Life of Véronique.)