Marcus Manilius originally hailing from Syria, was a Roman poet, astrologer, and author of a poem in five books called Astronomica.

The Astronomica, also known as the Astronomicon, is a Latin didactic poem about celestial phenomena, written in hexameters and divided into five books. The Astronomica was written c. AD 30–40 by a Roman poet whose name was likely Marcus Manilius; little is known of Manilius, and although there is evidence that the Astronomica was probably read by many other Roman writers, no surviving works explicitly quote him.