- Testing
- see Testing, notification and reporting - Testing, notification and reporting
- 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 - Treatment
- TRIPS
- see Intellectual property - Tuberculosis and HIV/AIDS
- see Opportunisitc infection