SINSpołeczna Inicjatywa Narkopolityki (Social Drug Policy Initiative) is a non-profit organization providing harm reduction services and education for change towards evidence-based drug policy.

SIN was formed as a network of science clubs at universities, which unites youth, students and academic staff who want to change the prohibition based drug policy in Poland and around the world.

The initiative is in dedicated to drug policy reform based on scientific evidence and principles of respect for human freedom and dignity.