This study identifies and analyses organised crime legislation in the Asia Pacific region. It examines offences criminalising the participation in criminal organisations and equivalent provisions penalising the existence and operation of organised crime under domestic laws. The study also explores the adoption of relevant international treaties, in particular the Convention against Transnational Organised Crime, and examines efforts by the international community to promote wider implementation of this Convention in the region. The aim of this study is to assess the adequacy and efficiency of the existing provisions under domestic and international laws, and to develop recommendations for law reform to prevent and suppress organised crime more effectively in the region.