This thesis is examining the perception of the Ustasha regime in the city of Zagreb between the 10th of April 1941 and the 8th of May 1945. The key goal is to establish whether that regime was considered to be legitimate or forced upon from the point of view of Zagreb citizens, and how did that perception possibly change during the four war years. To answer these questions, a micro-historical analysis is conducted on 46 memoirs and testimonies of people who experienced life in Zagreb during that time. The analysis is focused on four main theoretical elements of research. The first element deals with the reaction of the people of Zagreb during the establishment of the Independent State of Croatia and the arrival of German Nazi forces into the city. Secondly, I examine how changes in levels of control influenced changes in the behaviors of individuals in Zagreb and their perception of the regime. For this, the notion of control is based on specific political, sociological, and economic conditions that are reflected in everyday life in Zagreb or considered important factors in creating certain changes in behavior. The key points of research in that context are the presence of German Nazi forces, the signing of the Treaties of Rome, partisan activity in Zagreb and the nearer city area, bombings, and the economic situation in the city. Next, the paper examines in which way the systematic terror of the regime influenced the citizens of Zagreb, that is their actions and attitudes. Finally, the thesis considers the importance of personal motives such as material gain, family connections, the influence of love affairs, etc. In that aspect, the activity of the National liberation movement led by communists is also presented.