- IEC
- see Communications programming - IEC
- see Health education - Illicit drugs
- see Injecting drug use - Indigenous people and minorities
- Information
- see Communications programming - Information, education and communication materials
- see Communications programming - Information, education and communication materials
- see Health education - Injecting drug use
- Intellectual property
- Intimate partner transmission
- see Sex workers and clients - Intimate partner transmission
- see Sexual and reproductive health - IP
- see Intellectual property