| Abbreviation | Definition |
|---|---|
| TCGP | Translational- Clinical Grant Program |
| TCH | The Centers for Habilitation |
| TCHC | The Corner Health Center |
| TCHR | Tamil Centre for Human Rights |
| TCI | Trauma Care International |
| TCM | Tomorrow's Child/ Michigan |
| TCS | Tomorrow Customers Society |
| TCSF | Technical College System Foundation, Inc. |
| TCT | Trans Canada Trail |
| TCTCO | Trans Canada Trail Charitable Organization |
| TCTF | Trans Canada Trail Foundation |
| TCWT | The Civil War Trust |
| TDF | Theater Development Fund |
| TDI | Therapy Dogs International |
| TDY | Today Dads Yonder |
| TEA | Toronto Environmental Alliance |
| TEAR | Tsunami Emergency Asian Relief |
| TEDA | Texas Economic and Demographic Association |
| TEDA | Texas Educational Diagnosticians Association |
| TEF | Tailhook Educational Foundation |