This mixed-method study first provides insight into the Belgian prison population -- particularly foreign national prisoners -- based on an analysis of the penal database SIDIS Suite (N = 10,356). Second, qualitative telephone interviews have been conducted with the activity coordinators of all Flemish and Brussels prisons (N = 17) to investigate which prison activities (e.g., cultural, educational, and health-related activities, sports, vocational training, and forensic welfare services) are available to, and accessible by, foreign national prisoners. This article demonstrates several initiatives that have been taken to enhance foreign nationals' participation in prison activities and highlights the struggles that activity coordinators face in offering activities that are suitable for this population.