| CLS | Cable Landing Station 
| Others |
| CLS | Cadillac and La Salle
| Others |
| CLS | California Lightning Sprints
| Others |
| CLS | Call Logging System
| Others |
| CLS | Campus Linux Services
| Others |
| CLS | Canada Land Survey / Canada Land Surveyor
| Others |
| CLS | Canada Land Surveyor
| Others |
| CLS | Canadian Lumber Standard
| Others |
| CLS | Canadian Lumber Standards
| Others |
| CLS | Canadians lumber systems
| Others |
| CLS | Canonical Livepatch Service
| Others |
| CLS | Capillary Leak Syndrome
| Others |
| CLS | Capillary-Like Structures
| Others |
| CLS | Capsule Launch System
| Others |
| CLS | Card Loading Signal
| Others |
| CLS | Career and Leisure Services
| Others |
| CLS | Careers Life and Service
| Others |
| CLS | Cargo Loading System
| Others |
| CLS | Carrier Line Sharing
| Others |
| CLS | Cassette Locking System
| Others |
| CLS | Cathepsin-Like Substance
| Others |
| CLs | Cavalier Ls
| Others |
| CLS | Center for Language Science
| Others |
| CLS | Center for Language Study
| Others |
| CLS | Center for Lifetime Study
| Others |
| CLS | Center for Louisiana Studies
| Others |
| CLS | Central Locking System
| Others |
| CLS | Centralized Lubrication System
| Others |
| CLS | Certified Leasing Specialist
| Others |
| CLS | Certified Lotus Specialist
| Others |
| CLS | Certified Lubrication Specialist
| Others |
| CLS | Chambrair Lagerschrank Storage
| Others |
| CLS | Changing Lives Seminars
| Others |
| CLS | Chauffeur Limousine Service
| Others |
| CLS | Check Link State
| Others |
| CLS | Chemical and Life Sciences
| Others |
| CLS | Chicago Lifeguard Service
| Others |
| CLS | Chicago Linguistic Society
| Others |
| CLS | Chicago Linguistics Society
| Others |
| CLS | Christ Lutheran School
| Others |
| CLS | Christian Legal Society
| Others |
| CLS | Cigarette Lighter Socket
| Others |
| CLS | Cisco Lifecycle Services
| Others |
| CLS | Cisco Link Services
| Others |
| CLS | Clapboard Siding
| Others |
| CLS | Class definition file
| Others |
| CLS | Class Module
| Others |
| CLS | Class of Service
| Others |
| CLS | Classroom Learning Systems
| Others |
| CLS | Clear Last Screen
| Others |
| CLS | Clear Screen
| Others |
| CLS | Clear Signed Flag
| Others |
| CLS | CLear the Screen
| Others |
| CLS | Clinical Laboratory Science
| Others |
| CLS | Clinical Laboratory Sciences
| Others |
| CLS | Clinical Laboratory Scientist
| Others |
| CLS | Clinical Laboratory Scientist MedpseakUK
| Others |
| CLS | Clinical Laboratory Specialist MedpseakUK
| Others |
| CLS | Clone, Loan, and Steal
| Others |
| CLS | Closed Linear Span
| Others |
| CLS | Closed Loop Stimulation
| Others |
| CLS | Closed-Loop Stimulation
| Others |
| CLS | Club Lancia Sport
| Others |
| CLS | Coffin Lowry syndrome
| Others |
| CLS | Coffin-Lowry syndrome
| Others |
| CLS | College of Liberal Studies
| Others |
| CLS | Colorado Laboratory Services
| Others |
| CLS | Columbia Law School
| Others |
| CLS | Combat Life Saver
| Others |
| CLS | Combat Life Support
| Others |
| CLS | Comfort Lightweight Stability
| Others |
| CLS | Comfort Luxe Super
| Others |
| CLS | Command Line Scriptor
| Others |
| CLS | Commercial Level Simulations
| Others |
| CLS | Commercial Listing Service
| Others |
| CLS | Commission on Life Sciences
| Others |
| CLS | Common Language Specification
| Others |
| CLS | Common Language Specifications
| Others |
| CLS | Common Levels of Support
| Others |
| CLS | Community Legal Service
| Others |
| CLS | Community Legal Services
| Others |
| CLS | Community Living Services
| Others |
| CLS | Complement Lysis Sensitivity
| Others |
| CLS | Composite Leaf Spring
| Others |
| CLS | Computer Sensitive Language
| Others |
| CLS | Computer Systems Laboratory
| Others |
| CLS | Concept Learning System
| Others |
| CLs | Concessional Limits
| Others |
| CLS | Conditional Least Squares
| Others |
| CLS | Confocal Laser Scanning
| Others |
| CLS | Connectionless Server
| Others |
| CLS | Conservation Landscape Services
| Others |
| CLS | Conservation Leadership School
| Others |
| CLS | Consolidated Logistics Solutions
| Others |
| CLS | Consortium Loan Service
| Others |
| CLS | Constant Lower Speed
| Others |
| CLS | Constrained Least Squares
| Others |
| CLS | Contingency Landing Site
| Others |
| CLS | Continuous Linked Settlement
| Others |
| CLS | Contracted Logistic Support
| Others |
| CLS | Contractor Logistic Support
| Others |
| CLS | Contractor Logistics Support
| Others |
| CLS | Conversational Language System
| Others |
| CLS | Coolant Level Sensor
| Others |
| CLS | Coolant Level Switch
| Others |
| CLs | Cordoba Ls
| Others |
| CLS | Corners Last Slot
| Others |
| CLs | Cougar Ls
| Others |
| CLS | Country Language Services
| Others |
| CLS | Coup Leichtbau Silhouette
| Others |
| CLS | Coupe Leicht Sport
| Others |
| CLS | Coupe Leicht Sportlich
| Others |
| CLS | Coupe Limousine Sport
| Others |
| CLS | Coursework in Licensing Studies
| Others |
| CLS | Crack Loving Singer
| Others |
| CLS | Creative Lodging Solutions
| Others |
| CLS | Critical Language Scholarship
| Others |
| CLS | Critical Legal Studies
| Others |
| CLS | Crystal Lake South
| Others |
| CLS | Current Level of Service
| Others |
| CLs | Cutlass Ciera Ls
| Others |
| CLS | Cycle Line State
| Others |
| CLs | Cytotoxic Lymphocytes
| Others |
| CLS | Visual Basic Class module
| Others |