Ten Years of Harmony is an official double album compilation album released by the Beach Boys in 1981, and spanning their entire Brother Records-era up to that point (1970–80), including some unreleased or rare material.

Far from lucid, Brian Wilson would occasionally appear on stage, primarily as a replacement for brother Carl, who was embarking on a solo career.

Mike Love, Al Jardine and Bruce Johnston were the only stable members of a band who now had a whole cast of supporting musicians when they performed live.

Moreover, Ten Years of Harmony includes a 1979 A-side "It's a Beautiful Day" (which failed to chart), a Dennis Wilson-written track called "San Miguel" (which was a Sunflower-era outtake from 1969), a cover of "Sea Cruise", which was a rejected track from the 15 Big Ones sessions, and a selection from Dennis' solo album, Pacific Ocean Blue, "River Song".

Ten Years of Harmony, now out of print, sold enough in its release to reach number 156 in the US.