Philosophy in the Islamic World is a comprehensive and unprecedented four-volume reference work devoted to the history of philosophy in the realms of Islam, from its beginnings in the eighth century AD down to modern times. In the period covered by this second volume (eleventh and twelfth centuries). Both major and minor figures of the period are covered, giving details of biography and doctrine, as well as detailed lists and summaries of each author’s works. This is the English version of the relevant volume of the Ueberweg, the most authoritative German reference work on the history of philosophy ( Philosophie in der Islamischen Welt Band II: 11.–12. Jahrhundert. Zentrale und östliche Gebiete , Basel: Schwabe, 2021). Contributors Peter Adamson, Amos Bertolacci, Hans Daiber, Frank Griffel, Dimitri Gutas, Hermann Landolt, Wilferd Madelung, Jon McGinnis, Ahmed H. al-Rahim, David C. Reisman, Ulrich Rudolph, Tony Street, Johannes Thomann, and Renate Würsch.