Narcotics Anonymous (NA) is a twelve-step program of recovery from drug addiction, modeled on Alcoholics Anonymous (AA). It describes itself as a nonprofit "fellowship or society of men and women for whom drugs had become a major problem", and it is the second-largest 12-step organization. As of 2007 there were more than 43,900 NA meetings in 127 countries. The program is group-oriented, and is based on the Twelve Steps and the Twelve Traditions, adapted from AA.

The Narcotics Anonymous program

The only requirement for membership is "a desire to stop using," and members "meet regularly to help each other stay clean," where "clean" is defined as complete abstinence from all mood and mind altering substances (including alcohol). Membership in N.A. is free, and there are no dues or fees. The foundation of the Narcotics Anonymous program is the twelve steps and twelve traditions.

Narcotics Anonymous "has no opinion on outside issues," including those of politics, science, or medicine, and does not endorse any outside organization or institution. The fellowship does not promote itself, but rather attracts new members through public information and outreach. N.A. groups and areas supply outside organizations with factual information regarding the N.A. program, and individual members may carry the N.A. message to hospitals and institutions, such as treatment centers and jails.