This thesis will address the topic of the local electoral system and elections in post-war Mostar, which stands as the most prominent example of an ethnically divided city in Bosnia and Herzegovina. Despite administrative and territorial reintegration after the war, Mostar remained effectively divided into the western Croatian and eastern Bosniak parts. The paper examines the reasons behind this division and various other factors that led Mostar to be labeled as the "City of Case." The precondition of democracy entails the conduct of elections. They constitute pivotal stages in shaping citizens' political preferences, allowing them to choose between different political alternatives. The inability of the leading political elites in Mostar to reach an agreement, coupled with the influence of the international community and the imposition of provisions by the High Representative, resulted in the prolonged absence of local elections. This deprivation of basic rights, specifically the freedom to vote or be elected in local elections, affected the citizens of Mostar. The aim of this paper is to explore the reasons for Mostar's post-war ethnic division and the subsequent inability of leading political parties to agree on fundamental governance issues in the city. This ultimately led to the extended absence of local elections. The study will achieve this by analyzing the electoral system, past elections, and subsequent events.