Guillaume Bonnafond (born 23 June 1987) is a French former professional road bicycle racer, who rode professionally between 2009 and 2018 for the AG2R La Mondiale and Cofidis teams. He had excelled at both basketball and cycling as a youth, but eventually concentrated on the latter, training with Ag2r–La Mondiale's Chambéry Cyclisme Formation, subsequently joining the squad as an amateur and, in 2009 as a professional.