- Taipei
- see Taiwan, Republic of China, R.O.C. - Taiwan, Republic of China, R.O.C.
- Taiwan Weishengshu Jibing Guanzhiju
- see Division of AIDS and STD, Centre for Disease Control (1999 - ), Taiwan, R.O.C. - Taiwan, R.O.C., Division of AIDS and STD, Centre for Disease Control (1999 - )
- Te Tūāpapa Mate Āraikore O Aotearoa
- see New Zealand AIDS Foundation - Territory of American Samoa, American Samoa
- Territory of French Polynesia, French Polynesia
- Territory of Guam, Guam
- Territory of New Caledonia and Dependencies, New Caledonia
- Territory of the Wallis and Futuna Islands, Wallis and Futuna
- Testing
- see Testing, notification and reporting - Testing, notification and reporting
- Thai Network of People Living with HIV/AIDS
- Thai NGO Coalition on AIDS
- Thailand, Kingdom of Thailand
- Thailand Business Coaltion on AIDS (1993 - )
- Thailand, Kingdom of, AIDS Division, Bureau of AIDS, TB and STIs
- Therapeutics Research, Education, and AIDS Training in Asia
- see TREAT Asia (Therapeutics Research, Education, and AIDS Training in Asia) (2002 - ) - TLF Sexuality, Health & Rights Educators Collective
- TLF SHARE Collective
- see TLF Sexuality, Health & Rights Educators Collective - TNCA
- see Thai NGO Coalition on AIDS - TNP+
- see Thai Network of People Living with HIV/AIDS - Tokelau Islands
- Tonga, Kingdom of Tonga
- Trade Related Aspects of Intellectual Property Rights
- see Intellectual property - Trafficking of people
- Transactional sex
- see Sex workers and clients - Transgender
- Transmission
- see Injecting drug use - Transmission
- see Parent-to-child transmission - Transmission
- see Sexually transmitted infection - TREAT Asia (Therapeutics Research, Education, and AIDS Training in Asia) (2002 - )
- Treatment
- TRIPS
- see Intellectual property - Tuberculosis and HIV/AIDS
- see Opportunisitc infection - Tuvalu