Correlation European Harm Reduction Network is a European network and center of expertise based in Amsterdam, established in 2004. Hosted by the Foundation De Regenboog Groep, it focuses on drug use, harm reduction, and social inclusion. The network brings together various stakeholders, including grassroots organizations, service providers, research institutes, and health service providers, with over 150 organizational and 100 individual members from across Europe. C-EHRN actively participates in EU policy initiatives, collaborates with community-led organizations, and cooperates with other European networks and organizations to contribute to policy development, capacity building, and program implementation in the field of drugs and drug addiction.