| Abbreviation | Definition |
|---|---|
| CLPA | Cascade Locks Park Association |
| CLPA | Child Labour Programme of Action |
| CLPA | Collegiate Licensed Properties Association |
| CLPC | Children's Legal Protection Center |
| CLRA | Children's Leukemia Research Association |
| CLRI | Central Leather Research Institute |
| CLRSS | Cowichan Lake and River Stewardship Society |
| CLS | Christian Legal Society |
| CLS | Consortium Loan Service |
| CLSA | Contact Lens Society of America |
| CLSI | Clinical and Laboratory Standards Institute |
| CLSI | Clinical Laboratory Standards Institute |
| CLSNET | Christian Legal Society Network |
| CLSP | Center for Law and Social Policy |
| CLSU | Christian Legal Society University |
| CLT | Christopher Lee Tingen |
| CLWA | Canandaigua Lake Watershed Association |
| CLWA | Crescent Lake Watershed Association |
| CLWA | Crystal Lake Watershed Association |
| CLYO | Canadian-Lithuanian Youth Organization |