"This paper is a reprint of the catalogue prepared for the exhibition 'D. S. Brewer Mythography Collection', held at the Hiyoshi Media Centre from 24–28 November 2009 on the occasion of the 25th congress of the Japan Society for Medieval English Studies. In the spring of 2009 Toshiyuki Takamiya, Professor Emeritus at Keio University, donated the D. S. Brewer Mythography Collection to the Keio University Library. This collection was formed by the late Derek Stanley Brewer (1923–2008), a leading expert on Geoffrey Chaucer, the founder of academic publisher D. S. Brewer (now Boydell Brewer); Brewer also served as Master of the Emmanuel College from 1977–1990. The Mythography Collection comprises 190 items, including 16th–20th-century books mostly on Greek mythology and Brewer's typescripts of lectures, research notes and slides. Scholars and students from the Department of English examined the whole collection and recorded it bibliographically during the summer of 2009. On the basis of their research results, 10 representative items were chosen and displayed at the exhibition. They include Boccacio's Genealogie (Paris, 1511); Psd-Apollodorus's Bibliotheca (Rome, 1555); Vincenzo Cartari's Les images de dievx des anciens (Lyons, 1581); Natalis Conti's Mythologiae (Padua,1616); Alexander Ross's Mystagogus poeticus (London, 1648); Lactantius's Divinarum institutionum libri VII (Antwerp, 1570); Gerardus Vossius's De theologia gentili... (Amsterdam, 1668); Thomas Munckerus's (ed.) Mythographi latini (Amsterdam, 1681); Francesco Bardi's Ovidio istorico, politico, morale (Venice, 1696); and D. S. Brewer's typescript.