Ilion may refer to:
- Ilion (Ἴλιον) or, Latinized, Ilium, an antique name for the legendary city of Troy, hence the title of Homer's Iliad
- Ilion, Greece, a suburb of Athens, Greece, also known as Nea Liosia
- Ilion Animation Studios, a CGI animation studio based in Madrid, Spain
- Ilion, New York, a village in Herkimer County, New York