| CLSA | California Land Surveyors Association 
| Others |
| CLSA | California Library Services Act
| Others |
| CLSA | California Life Sciences Association
| Others |
| CLSA | Campus Life and Student Affairs
| Others |
| CLSA | Canadian Laboratory Suppliers Association
| Others |
| CLSA | Canadian Longitudinal Study on Aging
| Others |
| CLSA | Canon Law Society of America
| Others |
| CLSA | Caribbean Law Student Association
| Others |
| CLSA | Caribbean Law Students Association
| Others |
| CLSA | Certified Lead System Architect
| Others |
| CLSA | Chicano Latino Student Affairs
| Others |
| CLSA | Chicanx Latinx Staff Association
| Others |
| CLSA | Classical Latin School Association
| Others |
| CLSA | Closed Loop Stripping Analysis
| Others |
| CLSA | Conical Log Spiral Antenna
| Others |
| CLSA | Construction Lawyers Society of America
| Others |
| CLSA | Contact Lens Society of America
| Others |
| CLSA | Cooperative Logistics Support Arrangement
| Others |
| CLSA | Cornell Law Students Association
| Others |
| CLSA | County Lighting Service Area
| Others |
| CLSA | Cowan Lake Sailing Association
| Others |
| CLSA | Credit Lyonnais Securities Asia
| Others |
| CLSA | Cronies Lackeys Sycophants Amalgamated
| Others |