The Herzog August Library, in Wolfenbüttel, Lower Saxony, known also as Bibliotheca Augusta, is a library of international importance for its collection from the Middle Ages and early modern Europe. The library is overseen by the Lower Saxony Ministry for Science and Culture.

Wolfenbüttel is a town in Lower Saxony, Germany, the administrative capital of Wolfenbüttel District. It is best known as the location of the internationally renowned Herzog August Library and for having the largest concentration of timber-framed buildings in Germany, around 1000. It is an episcopal see of the Evangelical Lutheran Church in Brunswick. It is also home to the Jägermeister distillery, houses a campus of the Ostfalia University of Applied Sciences, and the Landesmusikakademie of Lower Saxony.