| TO | Treat Official | - | Chatting Acronyms |
| TO | Topological Orbital (in Graph Theory Of Molecules) | - | Computer Acronyms(common) |
| TO | Toxic Organic | - | Computer Acronyms(common) |
| TO | Operations Management (KSC Directorate) | - | Organizations |
| TO | Operations Management (TS) | - | Organizations |
| TO | Takeoff | - | Organizations |
| TO | Task Order | - | Organizations |
| TO | Technical Order | - | Organizations |
| TO | Training Officer (BSAC) | - | SMS Chat and Text |
| TO | Togo (FIPS 10-4 Country Code) - Tonga (ISO 3166 Digram) | - | Astronomy |
| TO | Tongan Language (ISO 639-1 Code) | - | Astronomy |
| TO | task order
| - | Human Genome |
