| Must B 21 | |
| Type: | studio |
| Artist: | will.i.am |
| Cover: | Mustb21.jpg |
| Released: | September 23, 2003 |
| Recorded: | April 2002 – July 2003 |
| Genre: | Alternative hip hop |
| Length: | 48:37 |
| Prev Title: | Lost Change |
| Prev Year: | 2001 |
| Next Title: | Songs About Girls |
| Next Year: | 2007 |
Must B 21 is the second studio album by American musician will.i.am. The album was released on September 23, 2003.
The album was released on September 23, 2003, and boasts a multitude of guest artists, including KRS-One, Phife Dawg, MC Supernatural, Planet Asia, FLII, John Legend, MC Lyte, Phil Da Agony and Tash, as well as fellow Black Eyed Peas Fergie and Taboo. The album itself is a collection of material recorded by Adams during the creation of the Black Eyed Peas album Elephunk. The project marked Adams' last release as a solo artist for over four years, until his third album Songs About Girls was released in late 2007. The album was originally only available on vinyl, but a CD and digital release followed in December 2003. Track seventeen on the release, "Go!", was used in the video games NBA Live 2005 and Madden NFL 2005. A video for the track was also recorded for use within the games; however, no official singles were released from the album. The artwork for the album was designed by Shepard Fairey.