Robert Fripp (born 16 May 1946) is an English musician, composer, record producer, and author, best known as the guitarist, founder and only constant member of the progressive rock band King Crimson. He has worked extensively as a session musician and collaborator, notably with David Bowie, Blondie, Brian Eno, Peter Gabriel, Peter Hammill, Daryl Hall, the Roches, Talking Heads, and David Sylvian. He also composed the startup sound of Windows Vista, in collaboration with Tucker Martine and Steve Ball. His discography includes contributions to more than 700 official releases.

His compositions often feature unusual asymmetric rhythms, influenced by classical and folk traditions. His innovations include a tape delay system known as "Frippertronics" (superseded in the 1990s by a more sophisticated digital system called "Soundscapes") and New Standard Tuning.

Fripp is married to English singer and actress Toyah Willcox.