"California Dreamin'" is a song written by John Phillips and Michelle Phillips in 1963 and first recorded by Barry McGuire. The best-known version is by the Mamas & the Papas, who sang backup on the original version and released it as a single in December 1965. The lyrics express the narrator's longing for the warmth of Los Angeles during a cold winter in New York City. It is recorded in the key of C-sharp minor.

John Edmund Andrew Phillips was an American folk rock musician. He was the leader of the vocal group the Mamas & the Papas and remains frequently referred to as Papa John Phillips. In addition to writing the majority of the group's compositions, he also wrote "San Francisco " in 1967 for former Journeymen bandmate Scott McKenzie, as well as the oft-covered "Me and My Uncle", which was a favorite in the repertoire of the Grateful Dead. Phillips was one of the chief organizers of the 1967 Monterey Pop Festival.