William James Adams Jr. (born March 15, 1975), known professionally as will.i.am (pronounced "will I am"), is an American rapper, singer, songwriter, record producer and actor. He is the frontman of the musical group Black Eyed Peas, which he formed with fellow rappers apl.de.ap and Taboo in 1995. The group, who released nine studio albums, saw their furthest mainstream success during their 2000s pop rap era with Elephunk (2003), Monkey Business (2005), The E.N.D. (2009), and The Beginning (2010). He served as lead vocalist since its formation, although for the albums, he did so alongside singer-songwriter Fergie—who joined the group in 2002 and departed after the latter.

As a solo artist, Adams released his first two albums, Lost Change (2001) and Must B 21 (2003) to lukewarm commercial response. The former was released by Atlantic Records, while the latter contained the song "Go!", which served as theme music for the NBA Live 2005 and Madden NFL 2005 seasons. His third album, Songs About Girls (2007), marked his first entry on the Billboard 200 as a solo act and spawned the moderate hit single, "I Got It From My Mama." His fourth album, #willpower (2013), peaked at number nine on the chart and was supported by the Billboard Hot 100-top five single, "Scream & Shout" (featuring Britney Spears). In addition, his guest appearances on Fergie's 2006 single "Fergalicious" and Usher's 2010 single "OMG", peaked at numbers two and one on the Billboard Hot 100, respectively.

A prolific record producer and songwriter, Adams has amassed credits on singles and albums for American, British and international artists including Michael Jackson, Kendrick Lamar, Rihanna, Miley Cyrus, Kanye West, Jennifer Hudson, U2, Kesha, Lady Gaga, Psy, Chris Brown, Justin Timberlake, Nicki Minaj, Estelle, Kid Cudi, Nas, Robin Thicke, John Legend, Cheryl, and 2NE1, among others. From his solo career and groupwork with the Black Eyed Peas, he has had 41 UK singles chart-top 40 entries since 1998, and has sold 9.4 million singles in the country. He founded a self-titled record label in 1998, which has signed artists including LMFAO, Kelis, and Macy Gray.

Outside of music, Adams founded the technology company i.am+ in 2013, and has served as a panelist and mentor on the reality competition series The Voice UK (2012–present), The Voice Australia (2014), and The Voice Kids (2017–2023). He is the recipient of seven Grammy Awards, a Latin Grammy Award, and a Daytime Emmy Award.