Abstract: The European Harm Reduction Network (EuroHRN) has been recently formed by ten organisations with a shared interest in advocating for and sharing knowledge on harm reduction within Europe. It is made up of three sub-regional networks covering North, South and Eastern Europe and managed by a coordinator based at the International Harm Reduction Association in the UK. * The North Europe Sub-Regional Network is led by Foundation De Regenboog Groep (the Netherlands) and Akzept (Germany). * The South Europe Sub-Regional Network is led by APDES (Portugal). * The Eastern Europe Sub-Regional Network is led by the Eurasian Harm Reduction Network (Lithuania). A specialist project on drug user networking is coordinated by ASUD (French national drug user organisation) working in partnership with the International Network of People who Use Drugs (INPUD). EuroHRN is coordinated by the International Harm Reduction Association and is advised by a Steering Group of ten organisations who manage the development of the project.