| CISL | Cambridge Institute for Sustainability Leadership 
| Others |
| CISL | Carol Info Services Limited
| Others |
| CISL | Center for the Improvement of Student Learning
| Others |
| CISL | Central Iowa Soccer League
| Others |
| CISL | Chemical Imaging and Structures Laboratory
| Others |
| CISL | Cleveland, Indianapolis, and St. Louis Railway Company
| Others |
| CISL | Cognitive and Immersive Systems Lab
| Others |
| CISL | Columnstore Indexes Scripts Library
| Others |
| CISL | Common Intelligence Services Layer
| Others |
| CISL | Common Intrusion Specification Language
| Others |
| CISL | Communication and Information Sciences Laboratory
| Others |
| CISL | Computational and Information Systems Laboratory
| Others |
| CISL | Computational Information Systems Laboratory
| Others |
| CISL | Confederazione Italiana Sindacati Lavoratori
| Others |
| CISL | Connecticut Interscholastic Ski League
| Others |
| CISL | Continental Indoor Soccer League
| Others |
| CISL | Converse International School of Languages
| Others |
| CISL | Curriculum Instruction and the Science of Learning
| Others |