Flavius Olybrius (Greek: Ολύβριος fl. 491-after 532) was an aristocrat of the Eastern Roman Empire and a consul for the year 491. He is sometimes referred to as "Olybrius Junior" in the sources, probably referencing his young age. Olybrius was through his mother Anicia Juliana a descendant of the conjoined Valentinianic and Theodosian dynasties, and the grandson of the emperor Olybrius (r. 472) and the great-grandson of Western Roman Emperor Valentinian III (r. 425–455). He was also a potential augustus on the death of the Eastern Roman Emperor Zeno (r. 474–491) of the Leonid dynasty.