20 Greatest Hits (subtitled The Tenth Anniversary Album) is a 1975 compilation album by Tom Jones. As the subtitle suggests, it had been ten years since Jones' first hit, "It's Not Unusual" in 1965. With a copyright date of 1974, the album was released in the UK on 28 February 1975. It reached No.1 on the charts in March for four consecutive weeks and was certified Gold, becoming his biggest album to that point. Half of the album's 20 tracks were top 10 hits, including two number ones.