"Wouldn't It Be Nice" is a song written by Brian Wilson, Tony Asher, and Mike Love for American rock band the Beach Boys, released as the opening track on their 1966 album Pet Sounds. The song was also released as a single two months after the album's release with "God Only Knows" as its B-side. In other countries, the sides were flipped, with "Wouldn't It Be Nice" as the single's B-side. Its lyrics describe a couple in love lamenting about being too young to run off to get married, fantasizing about how nice it would be if they were adults.