In the field of book publishing, a collection or, more precisely, editorial collection, is a set of books published by the same publisher, usually written by various authors, each book with its own title, but all grouped under the same collective title. The collective title is the title of the collection, it must be mentioned on each book.

The Bibliothèque de la Pléiade is a French editorial collection which was created in 1931 by Jacques Schiffrin, an independent young editor. Schiffrin wanted to provide the public with reference editions of the complete works of classic authors in a pocket format. André Gide took an interest in Schiffrin's project and brought it into Gallimard, under which imprint it is still published.