Sibyl Buck (born May 27, 1972) is an American musician, yoga instructor, and former fashion model.
Born in Versailles, France, Buck started her modeling career in 1992 and has worked for Yves Saint-Laurent, Chanel, Jean-Paul Gaultier, Alexander McQueen, and many other fashion houses.
After quitting the modeling industry in 1998, Buck became a mother and began playing rock music in bands. She played bass and sang in Champions of Sound with Chris Traynor of Orange 9mm and Helmet, and with Sergio Vega of Quicksand. In 2007 she recorded and performed with Joseph Arthur as a member of his backing band The Lonely Astronauts, and is credited as a musician on his Let's Just Be album. Buck currently plays bass guitar for Bush, filling in for Corey Britz on tour. She also acted, playing the personal assistant of Zorg in the 1997 film, The Fifth Element.