The thorax is the human chest, or division of an animal's body that lies between the head and the abdomen.
Thorax may also refer to:
- The thorax in arthropods, see Thorax (arthropod anatomy)
- Thorax (θώραξ), the Ancient Greek term for cuirass/breastplate
- Linothorax, Ancient Greek armour composed of linen
- Thorakitai, Hellenistic soldiers equipped with mail
- Thorax (cockroach), a genus of cockroach