INTRODUCTION The present catalogue describes the collection of Arabic manuscripts held at the Library of the School of Oriental and African Studies, University of London. The collection consists of over 400 items grouped in 394 entries, and embraces, in addition to such traditional Islamic disciplines as Tafsīr, Ḥadīth, Fiqh, etc., works on Mathematics, Astronomy, Medicine, Falconry, Archery, and Military Equitation. A sizeable proportion of the collection constitutes Shī’ah literature, with its 17 Ismā’īlī manuscripts of Indian provenance. The Shaikhī sect is represented by 37 tracts and responsa of Kāẓim al-Rashtī (no.277). Among the manuscripts described in the following pages the reader will find some with parallel or interlinear translation into a number of languages such as: Coptic (nos 46, 187), French (no.376), Italian (no.29), Malay (nos 35, 77, 230, 231, 287, 312, 378), Persian (nos 25, 64, 102, 248, 251, 287, 341), and Swahili (nos 201, 246, 255). The entries are arranged alphabetically by title, with references (see, =) grouped together and directly preceding the letter sequence. The alphabetical order has been adjusted in order to accommodate the system of transliteration, the additional letters being placed as follows: d, dh, ḍ: g, gh: h, ḥ: k, kh: s, sh, ṣs: t, th, ṭ. * The definite article (al) has been replaced by a hyphen (-) at the beginning of an entry, in the reference section and index of persons' names, and it has been disregarded as far as alphabetization is concerned. Abbreviated names such as ‘Al., Ḥ., M., etc., have been alphabetized as ‘Abd Allāh, Ḥasan, Muḥammad, etc. * This does not apply to the sequence of letters within a word.