| CTS | Cold-tea Sign / Cold Tea Syndrome - Refers To The Several Cups Of Cold Tea On The Bedside Cabinet Beside A Dead Geriatric (i.e. No-one Noticed The Patient Had Died) | - | NASA |
| CTS | Crazier Than Shit | - | NASA |
| CTS | Canadian Technology Satellite | - | Organizations |
| CTS | Ci'mPuter Test Set | - | Organizations |
| CTS | Communications And Tracking System | - | Organizations |
| CTS | COMPuterized Training System | - | Organizations |
| CTS | Clear-To-Send - Collective Training Standards - Communications Technology Service - Contract Technical Services - Conversation Time Sharing - COSMIC Top Secret | - | Astronomy |
| CTS | Comprehensive Telecommunications Services
| - | Human Genome |
