| Acronym | Definition |
|---|
| JEC | Jacobs Engineering Group (stock symbol) |
| JEC | Joint Economic Committee (US Congress) |
| JEC | Jornada Escolar Completa (Spanish: Full School Day; Chile) |
| JEC | Jeunesse Etudiante Catholique (French: Young Catholic Students; Ivory Coast) |
| JEC | Jaguar Enthusiasts Club (car club; various locations) |
| JEC | Jeunesse Etudiante Chretienne (French: Young Christian Students) |
| JEC | Jersey Electricity Company (UK) |
| JEC | Japan Electronics College (est. 1951) |
| JEC | Jonsson Engineering Center (Rensselaer Polytechnic Institute; Troy, NY) |
| JEC | Jardine Engineering Corporation (Hong Kong) |
| JEC | Jewish Educational Center (Elizabeth, NJ) |
| JEC | Japan Engineering Co., Ltd. (est. 1974) |
| JEC | Joint Executive Council |
| JEC | Japanese Electrotechnical Committee |
| JEC | Jorhat Engineering College (India) |
| JEC | Joint Evaluation Committee |
| JEC | Joint Europe Committee (UK) |
| JEC | Journal of Employment Counseling |
| JEC | Journal of Educational Change |
| JEC | James Earl (Jimmy) Carter (39th President of the USA) |
| JEC | Joliet Equipment Corporation |