Nuno Duarte Gil Mendes Bettencourt is a Portuguese-American guitarist. He became known as the lead guitarist of the Boston rock band Extreme. Bettencourt has recorded a solo album and has founded rock bands including Mourning Widows, DramaGods, and Satellite Party.

Extreme are an American rock band formed in Boston, Massachusetts, in 1985, that reached the height of their popularity in the late 1980s and early 1990s. They have released six studio albums, two EPs and two compilation albums since their formation. The band was one of the most successful rock acts of the early 1990s, selling over 10 million albums worldwide.