Criminal justice practitioners have a critical role to play in countering the growing transnational threat of Racially or Ethnically Motivated Violent Extremism (REMVE). To explore how criminal justice practitioners can most effectively tackle the REMVE phenomenon, the IIJ has launched a new initiative, which is being implemented with support from the Governments of the United States and the United Kingdom, to develop this IIJ Criminal Justice Practitioner’s Guide for Addressing REMVE. This guide focuses on how governments can address REMVE through criminal justice systems. The material that the Guide contains is intended to be useful to relevant civil society and community actors, as well as to a primary audience of criminal justice practitioners.