| Rank | Abbreviation | Meaning |
|---|
| ***** | CLEF | Centre de Loisirs et d'Enseignement du Français
| |
| **** | CLEF | Commercially Licensed Evaluation Facility
| |
| **** | CLEF | Certified Licensed Evaluation Facility
| |
| **** | CLEF | Commercially Licensed Evaluation Facilities
| |
| **** | CLEF | Chicagoland Lutheran Educational Foundation
| |
| **** | CLEF | Cross Language Evaluation Forum
| |
| *** | CLEF | Chinese Language Education Forum
| |
| *** | CLEF | Club Liaison Emploi Formation
| |
| *** | CLEF | Concerts and Lessons to Enrich Families
| |
| *** | CLEF | Commercial Licensed Evaluation Facilities
| |
| *** | CLEF | Comité Local Emploi Formation
| |
| ** | CLEF | Campus Life Enhancement Fund
| |
| ** | CLEF | Charlotte Local Education Foundation
| |
| ** | CLEF | Chinese Language Education Foundation
| |
| * | CLEF | Chautauqua Lake Education Fund
| |
| * | CLEF | Commercial Licensed Evaluation Facility
| |
| * | CLEF | Congreso Latinoamericano Estudiantes Filosofía
| |
| * | CLEF | Clinical Legal Education Foundation
| |
| * | CLEF | Cross Language Evalution Forum
| |
| * | CLEF | Confessional Lutheran Education Foundation
| |
| * | CLEF | Commercial Evaluation Facility
| |
| * | CLEF | Consumer Law Enforcement Forum
| |
| * | CLEF | Cross Lingual Evaluation Forum
| |
| * | CLEF | Caltech Laboratory for Experimental Finance
| |
| * | CLEF | COMMUNITY LEADERS EDUCATION FUND
| |