Robert Leo Farrelly Jr. is an American film director, screenwriter and producer. He is one of the Farrelly brothers, alongside his brother Peter, and together are known for directing and producing quirky, slightly offensive comedy films such as Dumb and Dumber, Shallow Hal, Me, Myself and Irene, There's Something About Mary, and the 2007 remake of The Heartbreak Kid. He made his solo directorial debut in 2023 with Champions.

Dumb and Dumber is a 1994 American buddy comedy film directed by Peter Farrelly, who cowrote the screenplay with Bobby Farrelly and Bennett Yellin. It is the first installment in the Dumb and Dumber franchise. Starring Jim Carrey and Jeff Daniels, it tells the story of Lloyd Christmas (Carrey) and Harry Dunne (Daniels), two dumb but well-meaning friends from Providence, Rhode Island, who set out on a cross-country trip to Aspen, Colorado, to return a briefcase full of money to its owner, thinking it was abandoned as a mistake though it was actually left as a ransom. Lauren Holly, Karen Duffy, Mike Starr, Charles Rocket, and Teri Garr play supporting roles.