The Qur'ān is the primary religious text for one-sixth of the world’s population. Understood by Muslims to contain God's own words, it has been an object of reverence and of intense study for centuries. The thousands of volumes that Muslim scholars have devoted to qur'ānic interpretation and to the linguistic, rhetorical and narrative analysis of the text are sufficient to create entire libraries of qur'ānic studies.

Drawing upon a rich scholarly heritage, Brill's Encyclopaedia of the Qur'ān (EQ) combines alphabetically-arranged articles about the contents of the Qur'ān. It is an encyclopaedic dictionary of qur'ānic terms, concepts, personalities, place names, cultural history and exegesis extended with essays on the most important themes and subjects within qur'ānic studies. With nearly 1000 entries in 5 volumes, the EQ is the first comprehensive, multi-volume reference work on the Qur'ān to appear in a Western language.

The Encyclopaedia of the Qurʾān online contains the complete articles of the printed volumes 1 to 5. The indices are scheduled to appear first Quarter of 2006.