"San Francisco (Be Sure to Wear Flowers in Your Hair)" is an American pop song, written by John Phillips, and sung by Scott McKenzie. It was produced and released in May 1967 by Phillips and Lou Adler, who used it to promote their Monterey International Pop Music Festival held in June of that year.

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.