Richie DiMaso is a fictional character from the movie American Hustle, directed by David O. Russell. He is portrayed by actor Bradley Cooper and is an ambitious FBI agent who becomes involved in a complex sting operation. DiMaso is known for his relentless pursuit of criminals and his willingness to bend the rules to achieve his goals. In the film, DiMaso recruits con artists Irving Rosenfeld and Sydney Prosser to help him catch corrupt politicians. His character embodies the themes of deception and ambition, showcasing the blurred lines between right and wrong in the world of crime and law enforcement.