Robert Fripp (born 16 May 1946) is an English musician, songwriter, record producer, and author, best known as the guitarist, founder and longest-lasting 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, 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 His innovations include a tape delay system known as "Frippertronics" (superseded in the 1990s by a more sophisticated digitally-based system called "Soundscapes") and a New Standard Tuning system for guitar.