- MAC
- see Malaysian AIDS Council (1992 - ) - Macao, Macao Special Administrative Region (China)
- Macao Special Administrative Region (China), Macao
- MACASHH
- see Ministerial Advisory Committee on AIDS, Sexual Health and Hepatitis (2003 - ), Australia, Commonwealth of - Macfarlane Burnet Institute
- see Centre for Harm Reduction, MacFarlane Burnet Institute for Medical Research and Public Health - Macfarlane Burnet Institute
- see Centre for International Health (1986 - ), MacFarlane Burnet Institute for Medical Research and Public Health - MacFarlane Burnet Institute for Medical Research and Public Health, Centre for Harm Reduction
- MacFarlane Burnet Institute for Medical Research and Public Health, Centre for International Health (1986 - )
- Mainstreaming
- Malaysia
- Malaysian AIDS Council (1992 - )
- Maldives, Republic of Maldives
- Maldives, Republic of Maldives, National AIDS Council (1987 - )
- MAP - Monitoring the AIDS Pandemic (1996 - )
- MAP Foundation (2002 - )
- Marie Stopes International (1976 - )
- Marshall Islands, Republic of the Marshall Islands
- MBCA
- see Myanmar Business Coalition on AIDS (2002 - ) - Medecins Sans Frontieres (1971 - )
- Media
- Mekong
- see Greater Mekong Subregion - Men and HIV/AIDS
- see Gender and HIV/AIDS - Men who have sex with men
- Microbicides
- Micronesia
- see Federated States of Micronesia - Migrant Assistance Program
- see MAP Foundation (2002 - ) - Migrants
- Military
- see Uniformed services - Ministerial Advisory Committee on AIDS, Sexual Health and Hepatitis (2003 - ), Australia, Commonwealth of
- Minorities
- see Indigenous people and minorities - Mith Samlanh (1994 - )
- Mobile men with money
- see Mobile populations - Mobile populations
- Mobile populations
- see Migrants - Mobile workers
- see Mobile populations - Mongolia
- Monitoring
- see Surveillance - Monitoring and evaluation
- Mother-to-child transmission
- see Parent-to-child transmission - MSF
- see Medecins Sans Frontieres (1971 - ) - MSI
- see Marie Stopes International (1976 - ) - MSM
- see Men who have sex with men - Myanmar
- Myanmar Business Coalition on AIDS (2002 - )