Severus the Platonist was a philosopher active in the late 5th or 6th century CE, during the final period of ancient Greek philosophy. He belonged to the Neoplatonic school, likely in the city of Alexandria, where philosophers taught Aristotle’s works as an introduction to Plato’s thought. His precise dates and personal details are not recorded.

His only known work was a commentary on Aristotle’s logical treatise On Interpretation. This work is now lost and is known only from a later summary written by the Byzantine scholar Photius in the 9th century. According to this source, Severus attempted to harmonize the philosophies of Plato and Aristotle, arguing that they agreed on important doctrines concerning the soul and the intellect. This approach of seeking agreement between the two great thinkers was characteristic of late Neoplatonism.

Severus’s significance lies in his role as a later representative of the ancient commentary tradition. His existence, attested only indirectly, helps illustrate how the study of Aristotle’s logic continued within Platonic circles into the 6th century CE, even after the Platonic school in Athens had closed. Modern scholars view him as an example of the enduring and adaptable nature of Greek philosophical teaching in late antiquity.