Daniel Michael DeVito Jr. (born November 17, 1944) is an Emmy Award-winning American actor, director, and an Oscar-nominated producer, who first gained prominence for his portrayal of "Louie De Palma" on the popular ABC and NBC TV series Taxi (1978–1983). This sitcom was not widely distributed outside of North America; in most other countries he is known primarily for his film work. In 2006 he began co-starring as Frank Reynolds on the FX sitcom It's Always Sunny in Philadelphia.

His wife is actress Rhea Perlman. DeVito was born in Neptune, New Jersey to Italian-American Catholic parents and raised in nearby Asbury Park. He boarded at Oratory Preparatory School, in Summit, New Jersey, graduating in 1961. He married actress Rhea Perlman on January 28, 1982. His career began with the part of Martini in the movie One Flew Over the Cuckoo's Nest (reprising his role from the 1971 off-Broadway play). After Taxi, DeVito continued what became a successful movie career, beginning with a role in 1983's Terms of Endearment and as the comic rogue in the 1984 romantic adventure Romancing the Stone, starring Michael Douglas and Kathleen Turner. All three reprised their roles in the 1985 sequel, The Jewel of the Nile. In 1986, he was in Ruthless People with Bette Midler and Judge Reinhold. In 1987, DeVito made his feature directing debut on dark comedy Throw Momma from the Train, in which he additionally starred, opposite Billy Crystal and Anne Ramsey. Two years later DeVito reunited with Douglas and Turner to direct and star with them in The War of the Roses. DeVito is married to actress Rhea Perlman, with whom he has three children - Lucie Chet DeVito (born March 1983), Grace Fan DeVito (born March 1985) and Jacob Daniel DeVito (born October 1987). DeVito and his family live in Manalapan, New Jersey. He is an outspoken Democrat and vegetarian. He is a supporter of the OneVoice Movement, a non-profit organization that strives to empower moderate Israelis and Palestinians to take a more assertive role in resolving their conflict.

DeVito has teamed up with world renowned restaurateur David Manero and Michael Brauser to open his first restaurant, which will be aptly named DeVito South Beach, in Miami Beach, Florida. DeVito South Beach opened to the public on June 18, 2007, after a series of high profile private parties featuring a cast of A-list celebrities and DeVito himself. Despite DeVito being a vegetarian, the restaurant will feature a contemporary Italian cuisine fused with characteristics of a traditional Italian chop house.