Learning from past atrocities, Cambodia has taken positive steps to ensure that future international crimes may be adequately prosecuted through its ratification of the Statute of the International Criminal Court (ICC) in 2002. However, an effective accountability mechanism and deterrence for any future crimes requires more than simply joining the ICC. There is a growing consensus that Member States should adopt the ICC crimes of genocide, crimes against humanity, and war crimes as part of their domestic law, as the absence of legislation may result in an inability to prosecute under the principle of complementarity. Cambodia has followed this trend and enacted implementing legislation into its new 2009 Cambodian Criminal Code (CCC). Scrutinizing the enacted international crimes provisions in the CCC, it becomes apparent that some modifications and reform to the current Cambodian criminal statutes are necessary in order to comply with the complementarity principle in the ICC Statute.