"Do It Again" is a song by American rock band The Beach Boys, written by Brian Wilson and Mike Love, who also share lead vocals. Produced by Wilson as a self-conscious callback to the band's earlier surf-based material, the song was released as a single on July 8, 1968, and subsequently placed on the band's 1969 album, 20/20. The single's B-side, "Wake the World", is taken from Friends, released the month before. "Do It Again" has been rerecorded once by the band (in 2011), once by Wilson as a solo artist (in 1995), and twice by Love as a solo artist (in 1996 and 2017).

"Do It Again" is a self-conscious callback to the band's earlier surf-based material. The lyrics to the song, originally entitled "Rendezvous", were inspired after a day Mike Love had spent at the beach in which he had gone surfing with an old friend named Bill Jackson. Mike then showed the lyrics to his cousin Brian Wilson, who proceeded to write the music to Mike's lyrics of nostalgia. Brian has stated in the past that he believes the song was the best collaboration that he and Mike ever worked on. In 2013, Love noted, "I came back from a surfing trip with some high school buddies and said: 'Hey Brian, I just went to the beach and the waves and the girls were great. We've got to do a song called "Do It Again".' He remembers it being at my house. I remember it as being at his house. He starts pounding at the piano, I was summoning up the words and we got a chorus together, which was basically a bunch of doo-wop inspired harmonies. We created that whole song in fifteen minutes."

Many critics and fans noted the return to the surfing style, which the band had generally avoided since 1964. Carl later explained the transition back to their old style in Melody Maker:

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