Peter A. Giles (born 17 June 1944, Havant, Hampshire, England) is a bass player and vocalist.
With his brother Michael Giles and Robert Fripp, he formed Giles, Giles and Fripp in 1967-8. Peter Giles was replaced by Greg Lake when Fripp and Michael Giles formed King Crimson. Peter Giles later made a guest appearance on King Crimson's second album In the Wake of Poseidon, and in 2002-2007, he united with other Crimson alumni in 21st Century Schizoid Band. The band toured to critical acclaim.
Giles also appeared with his brother Michael and Ian McDonald on the eponymous McDonald and Giles (Island Records [ILPS 9126] UK; Cotillion Records [SD 9042] US).
As of 2009, Giles was producing an album of original material with his wife Yasmine, under the banner of Aluna. This was slated for worldwide release later that year.