Eidos may refer to:
- Eidos (philosophy), a Greek term meaning “form” “essence”, “type” or “species”
- Eidos Interactive, a British video game publisher
- SCi Entertainment Group, its parent, which was briefly renamed Eidos Ltd.
- Eidos Hungary, a defunct Hungarian development studio formerly of Eidos Interactive
- Eidos-Montréal, a Canadian development studio of the same group
- EidosMedia, an Italian publishing software company.