| Acronym | Definition |
|---|
| CIER | Center for Integrative Environmental Research (University of Maryland) |
| CIER | Centre for Indigenous Environmental Resources (est. 1994; Manitoba, Canada) |
| CIER | Comisión de Integración Energética Regional (Montevideo, Uruguay - Regional Energetic Integration Commission) |
| CIER | Centre Interdisciplinaire d'Étude du Religieux (French: Interdisciplinary Religious Study Center) |
| CIER | Centre for Informatics Education Research (Open University; London, England, UK) |
| CIER | Centrul de Informare, Educare Si Resurse (Romania) |
| CIER | Council-Certified Indoor Environmental Remediator (American Council for Accredited Certification) |
| CIER | Centre for International Education and Research (UK) |