UN Agencies:
GF (The Global Fund to Fight AIDS, Tuberculosis and Malaria)
UNAIDS (Joint United Nations Programme on HIV/AIDS)
UNDP (United Nations Development Programme)
UNICEF (United Nations Children's Fund)
UNODC (United Nations Office on Drugs and Crime)
WHO (World Health Organization)
WHO Regional Office for Europe  

International organizations:
IDPC (International Drug Policy Consortium)
International HIV/AIDS Alliance
IHRA (International Harm Reduction Association)
ICASO (International Council of AIDS Service Organizations)
ITPC (International Treatment Preparedness Coalition)
International Federation of Red Cross and Red Crescent Societies
INPUD (International Network of People who Use Drugs)
Human Rights Watch

Organizations or projects in EE/CA:
AFEW (AIDS Foundation East-West)
ENPUD (Eurasian Network of People who Use Drugs)
ECUO (East Europe and Central Asia Union of PLWH)
Central Asia Regional HIV/AIDS Programme (CARHAP)
Regional Resource Center on Harm Reduction in Central Asia
Central Asia AIDS Control Project (CAAP)

Organizations or projects in Europe:
European Commission
EATG (European AIDS Treatment Group)
AIDS Action Europe
EMCDDA (European Monitoring Centre on Drugs and Drug Addiction)
EuroHRN (European Harm Reduction Network)
Correlation / European Network of Social Inclusion & Health
German BACKUP Initiative, Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ)
TAMPEP

Harm reduction groups outside EE/CA:
Asian, Latin American, US, Canadian, Caribbean and other networks

Private foundations:
Open Society Institute
• Global Drug Policy Program
• International Harm Reduction Development Program
• Law and Health Project
• Public Health Program on Access to Medicines
Tides Foundation

Private for-profit sector:
Axon Communications
Hoffman-La Roche Pharmaceuticals
Schering Plough