What actor has collaborated with Martin Scorsese on the most films?

Robert De Niro has collaborated with Martin Scorsese on more films than any other actor. Their partnership began with Mean Streets (1973) and includes ten feature films, from Taxi Driver and Raging Bull to Goodfellas, Casino, The Irishman, and Killers of the Flower Moon.

Their collaboration is one of the defining director-actor partnerships of American cinema. De Niro often played psychologically intense, morally complicated characters, while Scorsese shaped the films with expressive camera movement, musical editing, and stories rooted in crime, ambition, guilt, and obsession.

Leonardo DiCaprio is Scorsese's other major recurring leading actor, appearing in films such as Gangs of New York, The Aviator, The Departed, Shutter Island, and The Wolf of Wall Street. Joe Pesci also worked repeatedly with Scorsese, but in fewer films. De Niro and Scorsese additionally appeared together in the short film The Audition and both lent their voices to Shark Tale, but De Niro's ten feature-film collaborations establish him as the canonical answer.