The Union is a collaboration studio album by singer-songwriters Elton John and Leon Russell, released on 19 October 2010 in the US and on 25 October in the UK. This is John's second collaboration album, after 1993's Duets. This is the first studio release by John since 1979's Victim of Love without any of his regular band members. It is also his highest charting studio album on the Billboard 200 since 1976's Blue Moves, debuting at No. 3, as well as Russell's highest charting studio album since 1972's Carney. The Union was No. 3 on Rolling Stone magazine's list of the 30 Best Albums of 2010.

Leon Russell was an American musician and songwriter who was involved with numerous bestselling records during his 60-year career that spanned multiple genres, including rock and roll, country, gospel, bluegrass, rhythm and blues, southern rock, blues rock, folk, surf and the Tulsa sound. His recordings earned six gold records and he received two Grammy Awards from seven nominations. In 2011, he was inducted into both the Rock and Roll Hall of Fame and the Songwriters Hall of Fame.