Interest in the nature of the socio-political and ceremonial life of prehistoric inhabitants in recent years has resulted in an exchange of information between archaeologists and ethnologists. This paper is an initial effort to furnish a list of the kinds of social units to be found among Southwestern groups in the ethnographic present. It is hoped that this list will stimulate further discussion, bring about greater exchange of information, and result in a better understanding of the nature of prehistoric and ethnographic socio-political and ceremonial units in the American Southwest.