Here are some of the most notable films featuring the duo:
* Marriage Italian Style (Matrimonio all'italiana) (1964)
* Yesterday, Today and Tomorrow (Ieri, oggi, domani) (1963)
* The Sunflowers (I girasoli) (1970)
* The Cassandra Crossing (1976)
* The Voyage (Il viaggio) (1974)
* A Special Day (Una giornata particolare) (1977)
* The Price of Fame (La Grande Vadrouille) (1966) - This film also starred Louis de Funès, but Mastroianni and Loren were not in the same scenes.
While some sources might list more films they collaborated on, it's important to note that some films might only have had them in minor roles or guest appearances, not full-fledged starring roles.