Roger-Maurice Bonnet (b. 1937) is a French experimental astrophysicist specializing in stellar physics. From 1983 to 2001 he was Science Director of ESA and he created Horizon 2000. Under his lead, ESA launched the scientific projects, Giotto, Hipparcos, ISO, XMM, SOHO, Cluster, Cassini-Huygens and HST.