René Thomas (14 May 1928 (Ixelles) - 9 January 2017 (Rixensart) was a Belgian scientist.
His research included DNA biochemistry and biophysics, genetics, mathematical biology, and finally dynamical systems.
He devoted his life to the deciphering of key logical principles at the basis of the behaviour of biological systems, and more generally to the generation of complex dynamical behaviour.
He was professor and laboratory head at the Université Libre de Bruxelles, and taught and inspired several generations of researchers.