Physical planning in Croatia between 1955 and 1975 and Lefebvre’s theory of the production of space In this doctoral dissertation, the author analyzed physical planning in Croatia from 1955 to 1975, by bringing together different disciplinary discourses and the model of spatialization of state politics. The research was based on the simultaneous analysis of the prevailing physical planning discourses and practices, and the administrative, social, and political articulation of the state territory. Alongside the extensive review of secondary sources and reference literature, the author focused on the research of archival resources of the Urban Planning Institute of Croatia and the Urban Planning Institute of Dalmatia. The organization of the state territory and certain aspects of Croatian physical planning were theoretically framed through the work of the French theorist Henri Lefebvre (1901-1991) and related contemporary spatial and urbanization theorists. The dissertation is structured in six chapters. The first chapter introduced the theme, hypothesis, research methodology and provided international context to postwar urban and physical planning practices. The second chapter examined the models of territorial organization based on communal and economic reforms. The periodization of the territorial organization is as follows: locational regionalization (1945-1955), district regionalization (1955-1965), and inter-communal regionalization (1965-1975). This periodization represents the historical framework of the research. In the third chapter, each period was theoretically observed from the perspective of Lefebvre's theory of the production of space, his critique of the state, structuralism, and technocracy; as well as his concepts of the dialectics of centrality, the architecture of pleasure and collective luxury. While the former concepts refer to the theoretical framing of the state mode of the territorial production, the latter concepts also pertain to certain phenomena of Croatian urban and physical planning practices, such as the physical planning of the Adriatic coast. 270 In the fourth chapter, the author discussed the initial formation and development of the planning discipline in Croatia, organized in three periods which chronologically correspond to the abovementioned historical periodization: transitional period (1945-1955), formational period (1955-1965) and discursive period (1965-1975). Herein, the author also brought specific planning practices and discourses (technocratic, scientific, social, and ecological) into relation with the broader Yugoslav socio-political context and international urban and physical planning tendencies. The fifth chapter outlined nine regional plans and one national physical plan, which is the total number of this type of physical plans produced in Croatia between 1955 and 1975. The content of each plan was structured and presented in eight categories: organization, spatial coverage, methodology, goals, conception, implementation, related urban plans and graphic materials. This structure provided an overview of the Croatian physical planning practices in the given period and enabled the comparison of the plans. In conclusion, the sixth chapter provides a summary of the insights into the ideological and political formation of the state space, as well as the associated physical planning practices in Croatia. The chapter casted light on the work of several individual planners’ contribution to the disciplinary foundations. The author believes that these insights can be a starting point for the future theoretical and historical research and critical reflection on the continuity and discontinuity in the development of the national territory and physical planning discipline.