| Abbreviation | Definition |
|---|---|
| CIVC | Central Illinois Volunteerism Conference |
| CJCC | Carolinas Junior College Conference |
| CL | Conference Location |
| CLAAC | Canadian Library Association's Annual Conference |
| CLAI | Congreso Latinoamericano de Auditoria Interna |
| CLASS | Christian Leaders And Speakers Seminar |
| CLC | Central Lakes Conference |
| CLC | Congressional Leadership Conference |
| CLEC | Clinical Laboratory Educators Conference |
| CLEF | Conference and Labs of the Evaluation Forum |
| CLEF | Cross-Language Evaluation Forum |
| CLEO | Conference for Legal Education Opportunity |
| CLEO | Conference on Lasers and Electro-Optics |
| CLEO | European Conference on Lasers and Electro-Optics |
| CLLC | Conference on Language Learning and Culture |
| CLMC | Common Life Missions Conference |
| CLOWNS | Cross-Layer Optimized Wireless Networks Symposium |
| CLPA | Conference on Land Policy in Africa |
| CLRC | Coherent Laser Radar Conference |
| CLRI | Conference of Leaders of Religious Institutes |