IEC (disambiguation)
- Commodore bus
- Electoral Commission of South Africa
- IEC connectors
- In-ear monitors
- Independent Election Commission (Jordan)
- Inertial electrostatic confinement
- Institute of Catalan Studies
- Interactive evolutionary computation
- International Electrotechnical Commission
- International Engineering Company
- Interstate Economic Committee
- Ion exchange chromatography
- Island Eastern Corridor
- Israel Electric Corporation
- Itumbiara Esporte Clube