Troy (Greek: Ἴλιον, Ilion, and Τροία, Troia; Latin: Trōia and Īlium; Hittite: Wilusa or Truwisa; Turkish: Truva) was a city, both factual and legendary, located in northwest Anatolia in what is now Turkey, southeast of the Dardanelles and beside Mount Ida. It is best known for being the setting of the Trojan War described in the Greek Epic Cycle and especially in the Iliad, one of the two epic poems attributed to Homer. Metrical evidence from the Iliad and the Odyssey seems to show that the name Ἴλιον (Ilion) formerly began with a digamma: Ϝίλιον (Wilion). This was later supported by the Hittite form Wilusa.

A new city called Ilium was founded on the site in the reign of the Roman Emperor Augustus. It flourished until the establishment of Constantinople and declined gradually during the Byzantine era.