Regulations for control of radioactivity in food and the environment are myriad and complex. International and national bodies have formulated maximum permissible contamination limits in response to the 1986 Chernobyl accident and, more recently, in preparation for future radiological emergencies, either accidental or by malevolent intent. Individual countries have promulgated sets of regulatory limits, some based on international standards, some generated internally. To list control values for all countries would be impractical; therefore, this chapter will present a limited selection of regulations and recommendations from international agencies and some individual nations.