- 6th ICAAP
- see Sixth International Congress on AIDS in Asia and the Pacific (2001) - 7th ICAAP
- see Seventh International Congress on AIDS in Asia and the Pacific (2005) - ABConAIDS
- see Asian Business Coalition on AIDS - ACA
- see Hong Kong Advisory Council on AIDS (1990 - ), Hong Kong, Special Administrative Regions of the People's Republic of China - Access to treatment
- ACH2
- see Australian Centre for HIV and Hepatitis Virology Research - ACHIEVE (Action for Health Initiatives)
- Acquired immunodeficiency syndrome
- see HIV/AIDS - Action for AIDS (1988 - )
- ActionAid (1972 - )
- ADB
- see Asian Development Bank (1966 - ) - AFAO
- see Australian Federation of AIDS Organisations - Afghanistan, Transitional Islamic State of Afghanistan
- Afghanistan, Transitional Islamic State of Afghanistan, National AIDS Control Programme
- Agence canadienne de développement international
- see Canadian International Development Agency (1968 - ) - Agriculture/rural development
- AHRN
- see Asian Harm Reduction Network - AIDS
- see HIV/AIDS - AIDS Concern
- AIDS Division, Bureau of AIDS, TB and STIs, Thailand, Kingdom of
- AIDS in Asia
- see Asia Source: AIDS in Asia (2003 - ) - AIDS Research Centre (1988 - ), National Institute of Infectious Diseases, Japan
- AIDS Society of Asia and the Pacific
- AIDSNET
- see Danish NGO Network on AIDS and Development (AIDSNET) (2000 - ) - AIHI
- see Australian International Health Institute (1998 - ), The University of Melbourne - Airforce
- see Uniformed services - AIZHI
- see Beijing AIZHIXING Institute of Health Education - Alan Guttmacher Institute (1968 - )
- Alliance
- see International HIV/AIDS Alliance (1993 - ) - AMAL Human Development Network (1997 - )
- American Foundation for AIDS Research
- see amfAR (The Foundation for AIDS Research) (1985 - ) - American Samoa, Territory of American Samoa
- amfAR (The Foundation for AIDS Research) (1985 - )
- ANCA
- see Australian National Council on AIDS (1988 - 1996), Australia, Commonwealth of - ANCAHRD
- see Australian National Council on AIDS, Hepatitis C and Related Diseases (1999 - 2003), Australia, Commonwealth of - ANCARD
- see Australian National Council on AIDS & Related Diseases (1996 - 1999), Australia, Commonwealth of - Antenatal care
- see Mother-to-child transmission - Antenatal care
- see Reproductive health - Antiretroviral treatment
- see Treatments - APCASO
- see Asia Pacific Council of AIDS Service Organizations (1992 - ) - APEC
- see Asia-Pacific Economic Cooperation (1989 - ) - APLF
- see Asia Pacific Leadership Forum on HIV/AIDS and Development (2002 - ) - APN+
- see Asia-Pacific Network of People Living with HIV/AIDS (1994 - ) - APNSW
- see Asia Pacific Network of Sex Workers - APR
- see Asia Pacific Rainbow (1999 - ) - ARC
- see AIDS Research Centre (1988 - ), National Institute of Infectious Diseases, Japan - ARCSHS
- see Australian Research Centre in Sex, Health and Society (1992 - ), La Trobe University - Army
- see Uniformed services - ART
- see Treatments - ASAP
- see AIDS Society of Asia and the Pacific - ASEAN
- see Association of South-East Asian Nations (1967 - ) - ASHM
- see Australasian Society for HIV Medicine Inc. (1990 - ) - Asia Foundation
- see The Asia Foundation (1954 - ) - The Asia Foundation (1954 - )
- Asia Pacific Council of AIDS Service Organizations (1992 - )
- Asia Pacific Leadership Forum on HIV/AIDS and Development (2002 - )
- Asia Pacific Network of Sex Workers
- Asia Pacific PLWHA Resource Centre (2003 - )
- Asia Pacific Rainbow (1999 - )
- Asia Source: AIDS in Asia (2003 - )
- Asian Business Coalition on AIDS
- Asian Development Bank (1966 - )
- Asian Harm Reduction Network
- Asia-Pacific
- Asia-Pacific Economic Cooperation (1989 - )
- Asia-Pacific Network of People Living with HIV/AIDS (1994 - )
- Association of South-East Asian Nations (1967 - )
- AusAID
- see Australian Agency for International Development (1974 - ), Australia, Commonwealth of - Australasian Society for HIV Medicine Inc. (1990 - )
- Australia, Commonwealth of Australia
- Australia, Commonwealth of, Australian Agency for International Development (1974 - )
- Australia, Commonwealth of, Australian National Council on AIDS & Related Diseases (1996 - 1999)
- Australia, Commonwealth of, Australian National Council on AIDS (1988 - 1996)
- Australia, Commonwealth of, Australian National Council on AIDS, Hepatitis C and Related Diseases (1999 - 2003)
- Australia, Commonwealth of, Ministerial Advisory Committee on AIDS, Sexual Health and Hepatitis (2003 - )
- Australia, Commonwealth of, National Advisory Committee on AIDS (1984 - 1988)
- Australian Agency for International Development (1974 - ), Australia, Commonwealth of
- Australian Centre for HIV and Hepatitis Virology Research
- Australian Federation of AIDS Organisations
- Australian Government, Intergovernmental Committee on HIV/AIDS, Hepatitis C and Related Diseases (1987 - )
- Australian International Health Institute (1998 - ), The University of Melbourne
- Australian National Council on AIDS & Related Diseases (1996 - 1999), Australia, Commonwealth of
- Australian National Council on AIDS (1988 - 1996), Australia, Commonwealth of
- Australian National Council on AIDS, Hepatitis C and Related Diseases (1999 - 2003), Australia, Commonwealth of
- The Australian National University, Gender Relations Centre (1992 - )
- Australian Red Cross (1914 - )
- Australian Research Centre in Sex, Health and Society (1992 - ), La Trobe University