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 (Temple of Augustus and Rome).

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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.

• Mausoleum of Augustus, Rome