Bernard Paul Gregory (19.01.1919-25.12.1977) was a French physicist. He studied at the École Polytechnique (Paris) and at the Massachusetts Institute of Technology (USA). From 1951 he worked at the École Polytechnique (professor from 1958, and director of the laboratory from 1971), and in 1966 —71 he was director of CERN. From 1973 he was director of the National Centre for Scientific Research.
His scientific work concerned the physics of cosmic rays and the physics of elementary particles, in particular the discovery of new particles in cosmic rays and at accelerators.