| Acronym | Definition |
|---|
| CIEL | Center for International Environmental Law |
| CIEL | Common Interface Exchange Language |
| CIEL | Centre International d'Etude des Langues (France) |
| CIEL | Centre for Innovative and Entrepreneurial Leadership (Canada) |
| CIEL | Cours Intensifs Erasmus de Langues (French: Erasmus Intensive Language Courses) |
| CIEL | Centre d'Information sur l'Environnement de Longueuil (French: Longueuil Environmental Information Center; Longueuil, Quebec, Canada) |
| CIEL | Consortium for Innovative Environments in Learning (est. 2001) |
| CIEL | Center for International Education, La Salle (Mexico) |
| CIEL | Chinese Institute of European Languages (Taiwan) |