| COS | Call Originate Status 
| Others |
| COS | Canadian Oil Sands
| Others |
| COS | Canadian Oncology Society
| Others |
| COS | Canadian Ophthalmological Society
| Others |
| COS | Caravan Of Stars
| Others |
| COS | Card Operating System
| Others |
| COS | Carlisle Operating System
| Others |
| COS | Carousel Object Store
| Others |
| COS | Carousel Object System
| Others |
| COS | Carrier Operated Switch
| Others |
| COS | Carry-on Oxygen System
| Others |
| COS | Cassette Operating System
| Others |
| COS | Center for Open Science
| Others |
| COS | Central Office Special
| Others |
| COs | Central Offices
| Others |
| COS | Central Ohio Subarus
| Others |
| COS | Central Operating System
| Others |
| COS | Centre for Omic Sciences
| Others |
| COS | Certificate Of Service
| Others |
| COS | Certificate Of Sponsorship
| Others |
| CoS | Certificate of Suitability
| Others |
| COS | Certified Occupancy Specialist
| Others |
| COS | Chamber Of Secrets
| Others |
| COS | Champions Of The Sea
| Others |
| COS | Change Of State
| Others |
| COS | Change of Subject
| Others |
| COS | Check On Site
| Others |
| COS | Chief Of Security
| Others |
| COS | Chief Of Station
| Others |
| COS | Chief of Supply
| Others |
| COS | Chief Operations Specialist
| Others |
| COS | Child Outcomes Summary
| Others |
| COS | China Operating System
| Others |
| COS | Christ Our Savior
| Others |
| COS | Christian Outreach Service
| Others |
| COS | Church Of Satan
| Others |
| COS | Church Of Scientology
| Others |
| COS | Church Of the Shepherd
| Others |
| COS | Circle of Steel
| Others |
| COS | City of Colorado Springs Municipal Airport
| Others |
| COS | City of Colorado Springs Municipal Airport, Colorado Springs, Colorado USA
| Others |
| COS | City Of Saskatoon
| Others |
| COS | City Of Stirling
| Others |
| COS | Civilian Occupational Specialty
| Others |
| COS | Clear of Seal Position
| Others |
| COS | Clip On Socket
| Others |
| COS | Cloud Object Storage
| Others |
| COS | Cloud Operating System
| Others |
| COS | Cluster of Students
| Others |
| COS | Co-Orbiting Satellite
| Others |
| COS | Coil Over Shock
| Others |
| COS | Coil Over Suspension
| Others |
| COS | Collaborative Operating System
| Others |
| COS | Collection of Style
| Others |
| COS | College Of Science
| Others |
| COS | College Of Sciences
| Others |
| COS | College of the Sequoias
| Others |
| COS | College of the Siskiyous
| Others |
| COS | Colorado Springs Design Center
| Others |
| COS | Comet Operating System
| Others |
| COS | Commercial Operating System
| Others |
| COS | Common Object Services
| Others |
| COS | Common Operations Services
| Others |
| COS | COmmunications Segment
| Others |
| COS | Communications System
| Others |
| COS | Community Of Science
| Others |
| COS | Community Optional Service
| Others |
| COS | Company Of Song
| Others |
| COS | Company Orderly Sergeant
| Others |
| COS | Compatibility Operating System
| Others |
| COS | Completion Of Steer
| Others |
| COS | Computer Operating System
| Others |
| COS | Computer Operations Specialist
| Others |
| COS | Configuration Object Set
| Others |
| COS | Confirm On Site
| Others |
| COS | Connoisseur Of Sound
| Others |
| COS | Conqueror Of Shamballa
| Others |
| COS | Consequence of Sound
| Others |
| COS | Console Operating System
| Others |
| COS | Consumer Off the Shelf
| Others |
| COS | Content Optimization System
| Others |
| COS | Contest Of Speed
| Others |
| COS | Continental Signature
| Others |
| COS | contingency operating statIon
| Others |
| COS | Control Operating System
| Others |
| COS | Control System
| Others |
| COS | Cooper Ornithological Society
| Others |
| COS | Coordinadora de Organizaciones Sindicales
| Others |
| COS | Coordination Of Supply
| Others |
| COS | Copy Other System
| Others |
| COS | Corba Object Service
| Others |
| COS | Corba Object Services
| Others |
| COS | Corporation for Open Systems
| Others |
| COS | Corporation of Open Systems
| Others |
| COS | Corporation Of Seniors
| Others |
| COS | Corps Support
| Others |
| COS | Corrected On Site
| Others |
| COS | Cosine
| Others |
| COS | COSmetic registration number
| Others |
| COS | Cosmic Origins Spectrograph
| Others |
| COS | Cost Of Sale
| Others |
| COS | Cost Of Sales
| Others |
| COS | Cost Of Service
| Others |
| COS | Cosworth
| Others |
| COS | Counselors Only Section
| Others |
| COS | Covert Organization Search
| Others |
| COS | Cracco Outerspace Special
| Others |
| COS | Cray Operating System
| Others |
| COS | Criminal Organization System
| Others |
| COS | Critical Occupational Specialty
| Others |
| COS | Critical Operational Specialties
| Others |
| COS | Crypto Operating System
| Others |
| COS | Cult Of Spike
| Others |
| COS | Custom Operating System
| Others |
| COS | Cut Offs Scraps
| Others |