This dissertation examines how the Centralverein deutscher Staatsb�rger j�dischen Glaubens and the Volksverein f�r das katholische Deutschland utilized decentralization into the local and regional spheres to participate in German society, shape public and political discourse, and strengthen their respective community’s sense of belonging and identity. Drawing on the Centralverein and Volksverein’s administrative records held in archives in England and Germany, this dissertation assesses how their networks of local and regional branches operated and how power and responsibility shifted between the center and the periphery during the German Empire, the Weimar Republic, and Nazi Germany. In decentering away from their respective central office to focus on the local and regional branches, this dissertation argues that local and regional branches were the main sites in which religious minority groups constructed and reinforced their influence, whether political or social. Whether through providing legal or political defense or holding assemblies and lectures, religious minority associations worked to unite their members and create a unified front for political and social action on their own behalf. In promoting a positive connection to Jewishness while also defending Germanness, the Centralverein’s local and regional branches created tailored spaces in which Centralverein members could develop and affirm a synthesized German-Jewish identity while also asserting their civic belonging in the local, regional, and national spheres. Through both a comparative and integrated institutional history of the Centralverein and Volksverein’s decentralization, this dissertation provides a more detailed understanding of social and political relations between minority and majority communities during the German Empire, the Weimar Republic, and Nazi Germany. A comparative perspective allows for examining how minority religious associations responded and adapted to changes at the state level and navigated shifting means of self-assertion and political expression. In examining how German-Jewish and German-Catholic associations implemented decentralization and accommodated regionalization, this study decenters the examination of belonging, the pluralities of civic, regional, and religious identities and what it meant to represent religious minority interests in the German public sphere in the late nineteenth and early twentieth centuries.