An Augusteum (plural Augustea) was originally a site of imperial cult in ancient Roman religion, named after the imperial title of Augustus. It was known as a Sebasteion in the Greek East of the Roman Empire. Examples have been excavated in Sebaste/Samaria, Constantinople, Aphrodisias, Antioch, Cartagena, and (most famously) Ankara.
Since the 18th century, the term has also been used for certain academic and cultural buildings, such as the Augustea in Leipzig, Oldenburg, and Wittenberg.