EAI may refer to:
- East Asia Institute
- Electro-Acoustic improvisation
- Electronic Arts Intermix, an American art organization
- Electronic Associates, Inc., an American analog computer manufacturer
- Element AI, a former Canadian artificial intelligence company
- Email address internationalization
- Engineering Animation, Inc., a defunct American visualization software company
- Enterprise application integration, the use of software and computer systems' architectural principles to integrate a set of enterprise computer applications
- Erythema ab igne
- Excalibur Almaz, a Manx private spaceflight company
- Energy Alternatives India