Adrian Belew (born Robert Steven Belew, December 23, 1949) is an American guitarist, singer, songwriter, multi-instrumentalist and record producer. He is perhaps best known for his work as a member of the progressive rock group King Crimson (which he fronted from 1981 to 2009) and for his unusual, impressionistic approach to guitar playing which frequently involves sounds more akin to animals and machines than to standard instrumental tones.

Widely recognized as an "incredibly versatile player", Belew has released nearly twenty solo albums for Island Records and Atlantic Records which blend Beatles-inspired pop-rock with more experimental fare. His 2005 single "Beat Box Guitar" was nominated for a Grammy in the Best Rock Instrumental Performance category. In addition to being a member of King Crimson, he is also in the more straightforward pop band The Bears and fronted his own band, "Gaga", in the late 1970s and early 1980s. He has worked extensively as a session and touring musician, most famously with Talking Heads, David Bowie, Frank Zappa, and Nine Inch Nails.