| Tactical Environmental Support System | Academic & Science |
| Temporary Early Sleep Station | Academic & Science |
| Transiting Exoplanet Survey Satellite | Academic & Science |
| Talladega Electrical Service and Supply | Academic & Science |
| Tessco Technologies, Inc. | Business |
| Team Efficiency Stability Success | Business |
| Technology, English, and Social Studies | Community |
| Teaching English Support Service | Community |
| Teacher Excellence and Support System - Arkansas Teacher Evaluation | Community |
| Triennial Earth Sun Summit | Community |
| Teacher Excellence and Support System | Community |
| Teacher Evaluation and Support System | Community |
| the Exponential Encryption System | Computing |
| The Elite Saiyan Squad | General |
| The Endless Summer Song | General |
| Teaching Empathy Saving Species | General |
| Toyota Enterprise Security Services | General |
| Tsuneishi Economical Standard Ship | Governmental |
| Treatment Emergent Signs and Symptoms | Governmental |
| Toxic Exposure Surveillance System | Governmental |
| Texas Excavation Safety System | Governmental |
| Toronto Employment and Social Services | Governmental |
| Treatment Emergent Symptoms Scale | Medical |
| Tactical Environment Support System | Military and Defence |
| Tactical Engagement Simulation System | Military and Defence |
| Total Enterprise Security Service | Networking |
| Transcription Element Search System | Softwares |
| Trademark Electronic Search System | Softwares |
