| Abbreviation | Definition |
|---|---|
| TICO | Travel Industry Council of Ontario |
| TICP | Toronto Institute for Contemporary Psychoanalysis |
| TIDA | Tidatoronto Internet Developers Association |
| TIDA | Toronto Internet Developers Association |
| TIDA | Trucking Industry Defense Association |
| TIPA | Technical Image Press Association |
| TIRA | Traumatic Incident Reduction Association |
| TIRB | Treasury Investment Review Board |
| TISH | Truth in Sale of Housing |
| TJA | Thai Journalists Association |
| TLR | Total Line Reject |
| TMA | Tooling & Manufacturing Association |
| TMA | Treestand Manufacturer's Association |
| TMAC | Travel Media Association of Canada |
| TMCD | Technology and Management Centre for Development |
| TMS | The Minerals, Metals, & Materials Society |
| TMTFSWGCIU | Tile, Marble, Terrazzo, Finishers, Shop Workers & Granite Cutters International Union |
| TNMSC | Tamil Nadu Medical Service Corporation |
| TOMA | Texas Osteopathic Medical Association |
| TPA | Tennessee Psychological Association |