Harm Reduction refers to policies, programmes and practices designed to minimise negative health, social and legal impacts associated with various human behaviours using harmful products. Harm reduction is used to decrease the negative consequences of drug use and other elements, recognising that those unable or unwilling to stop can still make positive changes to protect themselves and others.

Harm reduction is most commonly applied to approaches that reduce adverse consequences of drug use. Harm reduction programmes now operate across various services and in different regions of the world. As of 2020, 86 countries had one or more programmes using a harm reduction approach to substance use.