In Descartes; A Collection of Critical Essays (Garden City, New York: Doubleday & Company, Inc., 1967), I published a bibliography of works in English relating to Descartes. This is a Supplement to that bibliography and contains references to works in English that have appeared since 1966 through 1975 or that inadvertently were not included in the original bibliography. The Supplement is in three parts: (A) Translations and Reference Works, (B) Books, and (C) Articles. In (C), I have also included chapters of books that can be read independently and that may be of interest to students of Descartes. There were of course borderline cases in which I had to decide whether an article contained enough material about Descartes to be included in the bibliography. On the whole, I believe I have followed a rather liberal policy in making these decisions.