• UNAIDS
  Joint United Nations Programme on HIV/AIDS
  UNAIDS, the Joint United Nations Programme on HIV/AIDS, brings together the efforts and resources of ten UN system organizations to the global AIDS response.

http://www.unaids.org/

• World Health Organization
  HIV infections:
  This page provides links to descriptions of activities, reports, news and events, as well as contacts and cooperating partners in the various WHO programmes and offices working on this topic. Also shown are links to related web sites and topics.
  
  http://www.who.int/topics/hiv_infections/en/
  
  
  
• Centers For Disease Control and Prevention
  As a part of its overall public health mission, CDC provides leadership in helping control the HIV/AIDS epidemic by working with community, state, national, and international partners in surveillance, research, and prevention and evaluation activities.
  
  http://www.cdc.gov/hiv/
  
  
  
• Until There Is A Cure
  Until There's A Cure® Foundation is a nonprofit organization that raises funds and awareness about HIV/AIDS through the sale of The Bracelet.
  
  http://www.until.org/
  
  
  
• AVERTing HIV and AIDS
  AVERT is an international HIV and AIDS charity based in the UK, with the aim of AVERTing HIV and AIDS worldwide.
  
  http://www.avert.org/