| Abbreviation | Definition |
|---|---|
| TAAP | The Autism Auto-immunity Project |
| TAB | IEEE Technical Activities Board |
| TAB | Technical Activities Board |
| TAB | Trinity's Assistance Bridge |
| TABE | Texas Association of Bilingual Education |
| TAC | Teens Against Cancer |
| TACA | Turkish American Cultural Alliance |
| TACF | The American Chestnut Foundation |
| TACF | TIS African Children Fund |
| TACF | Toronto Arts Council Foundation |
| TACL | Tennessee Association of Community Leadership |
| TADEPA | Tanzania Development and AIDS Prevention |
| TAF | Taiwanese American Foundation |
| TAF | The Asia Foundation |
| TAL | TMJ Association, LTD. |
| TALENT | Thespians Achieving Learning Entertaining Negotiating Together |
| TALK | Telephone Aid Line Kingston |
| TAMF | Taylor Anderson Memorial Fund |
| TANO | Texas Association of Nonprofit Organizations |
| TAP | Teens Against Polio |