Adrian Belew (born December 23, 1949 as Robert Steven Belew) is an American guitarist and vocalist (and sometimes drummer, pianist and bass player), perhaps best known for his work as a member of the progressive rock group King Crimson, which he first joined in 1981. He has also released a number of solo albums for Island Records and Atlantic Records, and has worked with many other musicians.

In addition, Belew is well-regarded for his contributions, particularly on guitar, to various other artists' recordings. In 1977, he performed with Frank Zappa, appearing in Zappa's 1979 concert film Baby Snakes, as well as Zappa's controversial album Sheik Yerbouti. He also supported David Bowie on his Sound + Vision tour in the late 80s as musical director, playing guitar and singing backing vocals.

Belew's other session credits include the 1980 album Remain in Light by the Talking Heads, Lights Out by Peter Wolf, and Paul Simon's landmark 1986 album Graceland. He worked with Laurie Anderson during the mid-1980s, appearing in her concert film Home of the Brave. During the 1990s, he contributed to two Nine Inch Nails albums, The Downward Spiral and The Fragile. He played synthesized guitar on the song "God Shuffled His Feet" by Crash Test Dummies in 1993.

In the late-1980s, Belew formed the pop band The Bears with ex-Raisins members and released two albums, The Bears and Rise and Shine. A third album, Car Caught Fire, followed in 2001.

He features prominently on Tori Amos's 2001 cover album, "Strange Little Girls". He also contributed his lead guitar stylings to Porcupine Tree's album Deadwing (2005) as well as to a track ("I Can't Get Behind That", also featuring Henry Rollins) on the 2004 Ben Folds-produced William Shatner album Has Been.