Miracles Only Happen Once (French: Les Miracles n'ont lieu qu'une fois, Italian: I miracoli non si ripetono) is a 1951 French-Italian drama film directed by Yves Allégret and starring Jean Marais, Alida Valli and Marcelle Arnold.

The film's sets were designed by the art directors Alexandre Trauner and Auguste Capelier.

The educational year is ending and Jérôme, a medical student, is on the point of leaving on holiday to Brittany with friends.

However he remains pensive and regrets not having approached Claudia, an Italian student, who must leave France the same evening.

The two young people acknowledge their mutual love and Jérôme accompanies Claudia to the station and promises to join her in Tuscany the next month, as soon as he finds enough money.