Michaël Gillon (born 1974) is a Belgian astronomer and astrophysicist. His research focuses on exoplanets and he conducts his research at the University of Liège. He holds a master's degree in biochemistry and astrophysics and also a PhD in astrophysics, and completed his post-doctorate at Geneva Observatory. Co-discoverer of exoplanets such as WASP-18 b and the rings of (10199) Chariclo, he is a researcher at the Institute of Astrophysics and Geophysics of the Department of Astrophysics, Geophysics and Oceanography and co-director of the Astrobiology Research Unit of the University of Liège (Belgium). Michaël Gillon is at the origin of the discovery of the TRAPPIST-1 exoplanetary system.