| Acronym | Definition |
|---|
| CTO | (USN Rating) Cryptologic Technician (Communications) |
| CTO | Cadet Third Officer |
| CTO | Cadet Training Officer |
| CTO | Central Ticket Office |
| CTO | Certificate to Operate |
| CTO | Certificate to Operate (USAF system certification) |
| CTO | Certified Tradeable Offset |
| CTO | Change Task Order |
| CTO | Chief Telecommunications Officer |
| CTO | Chief Transport Officer |
| CTO | City of Thousand Oaks (California) |
| CTO | Cognizant Transportation Office |
| CTO | Combined Test Organization (US Army) |
| CTO | Commander Task Unit |
| CTO | Commander's Training Objective (US Army) |
| CTO | Commercial Taxes Officer (India) |
| CTO | Commercial Transportation Office |
| CTO | Commercial Travel Office (Defense Finance and Accounting Service) |
| CTO | Communications Tasking Order (US Air Force) |
| CTO | Compensatory Time Off |
| CTO | Computer Tasking Order |
| CTO | Concurrent Test and Operations (Army) |
| CTO | Consent to Operate (India) |
| CTO | Consolidated Tasking Order |
| CTO | Construction Task Order (US Air Force) |
| CTO | Continental Test Organization |
| CTO | Contract Tracking and Oversight |
| CTO | Contract Travel Office |
| CTO | Control Technology Office |
| CTO | Control Tower Operator |
| CTO | Controlled Transient Oscillation |
| CTO | Controller Training Outline |
| CTO | Conventional Takeoff |
| CTO | Corrections Training Officer (law enforcement) |