I review several bodies of empirical urban theory relevant to the archaeological analysis of ancient cities. Empirical theory is a type of "middlerange theory" (following Robert Merton): sets of concepts and methods that are less abstract, and have greater empirical content, than high-level social theory. The categories of theory reviewed here include environment-behavior theory, architectural communication theory, space syntax, urban morphology, reception theory, generative planning theory, normative theory, and city size theory. Most of these approaches originated in the fields of architecture, planning, and geography, and they directly link the urban-built environment to the actions of people within cities.Keywords Urbanism . Theory . Planning . Middle-range theory . Built environment Archaeological research on ancient cities and urbanism exhibits a wide range of perspectives on the use of theory. Some archaeologists pursue descriptive research with little explicit use of theory, while others embrace high-level social theory. Still others chart a course between these poles by using lower-level concepts. Work in this latter category is more abstract than empirical description but more grounded and less abstract than high-level social theory. I call this body of work "empirical urban theory," and in this paper I argue that this is an especially productive explanatory approach for understanding ancient cities and urban life. In defining "theory" I follow anthropologist Roy Ellen, who states that theories, provide us with a framework through which we can explain and interpret data, and they should do so parsimoniously. So, we might define theory as 'A supposition or body of suppositions designed to explain phenomena or data' (Ellen 2010: 390).