Miracles Only Happen Once is a 1951 French-Italian drama film directed by Yves Allégret and starring Jean Marais, Alida Valli and Marcelle Arnold. The film is about a "psychic war-casualty" played by Jean Marais. It was shot at the Saint-Maurice Studios in Paris. The film's sets were designed by the art directors Alexandre Trauner and Auguste Capelier.