| Abbreviation | Definition |
|---|---|
| TWC | The Wellness Community |
| TWCCTW | Together We Can Change the World |
| TWDC | Tremont West Development Corporation |
| TWF | The WILD Foundation |
| TWF | The Wisdom Fund |
| TWF | Tiger Woods Foundation |
| TWF | Tracy Wrestling Foundation |
| TWIF | The World is Fun! |
| TWIG | Terrific Women In Giving |
| TWIG | The World Issues Group |
| TWP | The Wildlands Project |
| TWP | Trees, Water, and People |
| TWU | Two Worlds United |
| TWUEF | Two Worlds United educational foundation |
| TWW | Teaming With Wildlife |
| TWWP | The Walden Woods Project |
| TWYVA | Taiwan World Youth Volunteer Association |
| TYF | The Yosemite Fund |
| TZD | Toward Zero Deaths |
| UA | Unanieme Alcoholisten |