- Mainstreaming
- Media
- Men and HIV/AIDS
- see Gender and HIV/AIDS - Men who have sex with men
- Microbicides
- Migrants
- Military
- see Uniformed services - Minorities
- see Indigenous people and minorities - Mobile men with money
- see Mobile populations - Mobile populations
- Mobile populations
- see Migrants - Mobile workers
- see Mobile populations - Monitoring
- see Surveillance - Monitoring and evaluation
- Mother-to-child transmission
- see Parent-to-child transmission - MSM
- see Men who have sex with men