| Abbreviation | Definition |
|---|---|
| TMV | Thermal Margin Verification |
| TMZ | Turbidity Maximum Zone |
| TN | Technical Note |
| TNL | Tunnel |
| TNO | Trans Neptunian Object |
| TNP | Test Not Performed |
| TO | Operations Management (KSC Directorate) |
| TO | Operations Management (TS) |
| TO | Takeoff |
| TO | Task Order |
| TOC | Test Operations Center |
| TOC | Test Operations Change |
| TOC | Total Organic Carbon |
| TOD | Time-Out Detection |
| TOF | Test Operations Facility |
| TOG | Toggle |
| TOGA | Tropical Ocean Global Atmosphere |
| TOI | Transfer Orbit Insertion |
| TOM | Take Off Mass |
| TOM | Testing Organization Management |