A bibliography of books, articles and reviews on Islam and the Muslim world which were published in the year 2021 with additions from 2001-2020. This annual volume is published as part of the 2022 subscription. It supersedes the advance issues published in 2022, as well as containing much data not previously published in Index Islamicus.

Index Islamicus is the most important international classified bibliography of publications in European languages on all aspects of Islam and the Muslim world from 1906 onwards until present day. Material cited in the Index Islamicus includes not only work written about the Middle East, but also about the other main Muslim areas of Asia and Africa, plus Muslim minorities elsewhere. The Index Islamicus is edited by Gregor Schwarb, Heather Bleaney, Pablo García Suarez and others.