From the Preface: There are three volumes. The first one contains a curriculum vitae, a Breve Analyse des Travaux and a Iist of publications, including books and seminars. In addition the volume contains all papers of H. Cartan on analytic functions published before 1939. The other papers on analytic functions, e.g. those on Stein manifolds and coherent sheaves, make up the second volume. The third volume contains, with a few exceptions, all further papers of H. Cartan; among them is a reproduction of exposes 2 to 11 of his 1954/55 Seminar on Eilenberg-MacLane algebras. Each volume is arranged in chronological order. The reader should be aware that these volumes do not fully reflect H. Cartan's work, a large part of which is also contained in his fifteen ENS-Seminars (1948-1964) and in his book Homological Algebra with S. Eilenberg... Still, we trust that mathematicians throughout the world will welcome the availability of the Oeuvres of a mathematician whose writing and teaching has had such an influence on our generation.