15 Big Ones is the twentieth studio album by American rock group The Beach Boys released in July 1976. It comprises cover versions of rock and roll and rhythm and blues standards, along with a few new originals. The album was met with mixed reviews, but the highest sales the band had for a new studio album in many years, peaking at number 8 on the weekly Billboard albums chart. Three singles were issued: a cover of Chuck Berry's "Rock and Roll Music" and the originals "It's O.K." and "Everyone's in Love with You". The first two charted on the Billboard Hot 100 at numbers 5 and 29, respectively, and ultimately became their only top 30 hits during the 1970s.With Blondie Chaplin and Ricky Fataar having left the Beach Boys following their preceding album Holland (1973), 15 Big Ones was recorded at a time when the group was struggling with their creative direction. Responding to the unexpected success of the greatest hits compilation Endless Summer (1974), Brian Wilson, who had not received a solo producing credit for any of the band's albums since Pet Sounds (1966), was brought in to oversee the 15 Big Ones sessions. Although the band had begged for him to return, they resisted his desire for an underproduced sound. Upon its release, brothers Carl and Dennis Wilson voiced disappointment with the album, calling it "unfinished" and "a bruising process".

With Blondie Chaplin and Ricky Fataar having left the Beach Boys following their preceding album Holland (1973), 15 Big Ones was recorded at a time when the group was struggling with their creative direction. Responding to the unexpected success of the greatest hits compilation Endless Summer (1974), Brian Wilson, who had not received a solo producing credit for any of the band's albums since Pet Sounds (1966), was brought in to oversee the 15 Big Ones sessions. Although the band had begged for him to return, they resisted his desire for an underproduced sound. Upon its release, brothers Carl and Dennis Wilson voiced disappointment with the album, calling it "unfinished" and "a bruising process".