Claude Bloch (18 March 1923 – 29 December 1971) was a French theoretical nuclear physicist.
He authored over 60 published articles and made significant impact on the fields of quantum field theory, nuclear physics, and the many-body problem.
He studied at the Bohr Institute in Copenhagen from 1948-1951 where he worked on the problems in the non-local theory of quantum fields.
Upon returning to France in 1953, he joined the Commissariat à l'Energie Atomique (CEA), where he stayed until his death in 1971.
While at the CEA, he directed the theoretical physics department at Centre d'Études Nucléaires de Saclay, Gif-sur-Yvette.