 Henri Poincaré was a mathematician, theoretical physicist and a philosopher of science famous for discoveries in several fields and referred to as the last polymath, one who could make significant contributions in multiple areas of mathematics and the physical sciences. This survey will focus on Poincaré’s philosophy. Concerning Poincaré’s scientific legacy, see Browder (1983) and Charpentier, Ghys, Lesne (2010).