We extend the law and economics analysis of spectrum management by considering the economic case for Indigenous and tribal spectrum sovereignty. We use case studies from the United States, Guatemala, Canada, and New Zealand to show that these movements seek a polycentric system of spectrum management that contrasts with the prevailing monocentric systems of spectrum management in which national governments have the primary authority over spectrum governance. Theories of polycentricity and federalism offer insight into the efficiency of Indigenous and tribal spectrum sovereignty as well as polycentric spectrum sovereignty more generally.