Longus, sometimes Longos (Greek: Λόγγος), was the author of an ancient Greek novel or romance, Daphnis and Chloe. Nothing is known of his life; it is assumed that he lived on the isle of Lesbos (setting for Daphnis and Chloe) during the 2nd century AD .
It has been suggested that the name Longus is merely a misinterpretation of the last word of Daphnis and Chloe's title Λεσβιακῶν ἐρωτικῶν λόγοι ("story of a Lesbian romance", "Lesbian" for "from Lesbos island") in the Florentine manuscript; Seiler also observes that the best manuscript begins and ends with λόγου (not λόγγου) ποιμενικῶν. If his name was really Longus, he was probably a freedman of some Roman family which bore that name as a cognomen.
Other ancient Greek novelists: