The object of this paper is to describe as clearly as possible the elements of divine service during the period of the Fourth Dynasty of Ur, that is, from the beginning of the reign of Ur Engur to the end of the reign of Ibi-Sin. The elements are taken to be gods, temples, altars, sacrifices, dedications, ritual and festivals. Our study will be based upon only those in scriptions which can be dated with certainty. They are royal inscriptions, numerous business tablets, and seal cylinders and other similar works of art. In a companion article, to be published in the Journal of the American Oriental Society, a study was made of divine service in early Sumeria, that is, in Early Lagash. The