Lamberto Maggiorani

When elderly pensioner Umberto Domenico Ferrari returns to his boarding house from a protest calling for a hike in old-age pensions, his landlady demands her 15,000-lire rent by the end of the month or he and his small dog will be turned out onto the street. Unable to get the money in time, Umberto fakes illness to get sent to a hospital, giving his beloved dog to the landlady's pregnant and abandoned maid for temporary safekeeping.

After years spent working as a prostitute in her Italian village, middle-aged Mamma Roma has saved enough money to buy herself a fruit stand so that she can have a respectable middle-class life and reestablish contact with the 16-year-old son she abandoned when he was an infant. But her former pimp threatens to expose her sordid past, and her troubled son seems destined to fall into a life of crime and violence.

Unemployed Antonio is elated when he finally finds work hanging posters around war-torn Rome. However on his first day, his bicycle—essential to his work—gets stolen. His job is doomed unless he can find the thief. With the help of his son, Antonio combs the city, becoming desperate for justice.