Antinous, also called Antinoös, (/ænˈtɪnoʊʌs/; Ancient Greek: Ἀντίνοος; c. 111 – c. 130) was a Greek youth from Bithynia, a favourite and lover of the Roman emperor Hadrian. Following his premature death before his 20th birthday, Antinous was deified on Hadrian's orders, being worshipped in both the Greek East and Latin West, sometimes as a god (θεός, theós) and sometimes merely as a hero (ἥρως, hḗrōs).
Little is known of Antinous's life, although it is known that he was born in Claudiopolis (present day Bolu, Turkey), in the Roman province of Bithynia et Pontus. He was probably introduced to Hadrian in 123, before being taken to Italy for a higher education. He had become the favourite of Hadrian by 128, when he was taken on a tour of the Roman Empire as part of Hadrian's personal retinue. Antinous accompanied Hadrian during his attendance of the annual Eleusinian Mysteries in Athens, and was with him when he killed the Marousian lion in Libya, an event highly publicised by the Emperor. In October 130, as they were part of a flotilla going along the Nile, Antinous died amid mysterious circumstances. Various suggestions have been put forward for how he died, ranging from an accidental drowning to an intentional human sacrifice or suicide.