Gamblers Anonymous (GA) is a widely available support group for problem gamblers, but its effectiveness is not known. This study reviewed research studies on GA that were published between 2002 and 2015. Overall, the evidence for GA’s effectiveness as a treatment is mixed. A “compulsive gambler” identity, patience, and using prayer to help accept financial matters and realityare important aspects of GA. The focus of GA meetings tends to be on gambling issues important to men, although GA has become more attuned to issues important to women over the last 10 – 20 years. Future research should examine the impact of social networks established through GA for women and the number of GA meetings attended on treatment outcomes.