Their 16 Greatest Hits is the third compilation album by the American rock band The Grass Roots. It was originally released by Dunhill Records in September 1971 shortly after the success of "Sooner or Later" earlier that year (see 1971 in music). The album also included many other hit singles that were released from 1966 to 1971. The album was released on both stereo LP & tape as well as in Quadraphonic Sound on both LP & tape. This album was the only Quadraphonic album released by The Grass Roots.