Religious sentiments have become a potent tool for political elites, altering national identities and citizenship criteria. This manipulation, driven by majoritarian ideologies, has marginalized religious minorities, leading to discrimination, violence, and legal persecution against them. Hindu, Islamic, and Buddhist nationalisms seem to collectively erode secular democracy in South Asia. Moreover, right‐wing populist leaders, notably Modi in India and the Rajapaksas in Sri Lanka, have merged religious nationalism with authoritarian political orientations posing a challenge to democratic foundations and impacting significantly on the dynamics of state and societal relations. This is the context in which this World Affairs 2024 special issue delves into the relationship(s) between religion, politics, and authoritarianism in the South Asian region. It examines the evolving “religion‐politics” nexus or “complex” to explicate the relationship between religion and authoritarianism, particularly with respect to authoritarian governments mobilizing religion as a readily available resource for popular political mobilization, legitimization, and power consolidation. India's BJP employs Hindutva ideology to marginalize minorities, Bangladesh's regime uses Islam for political legitimacy, and Sri Lanka's Sinhala‐Buddhist nationalism fosters exclusionary policies. By fostering social and cultural polarization, this fusion of authoritarianism with religious nationalism poses a serious challenge to the secular state. The articles in this special issue explore these themes comprehensively, delving into the ideological foundations of political decisions and their consequences for marginalized communities. By shedding light on this multifaceted interplay, the collection offers valuable insights into South Asia's sociopolitical landscape, serving as a vital resource for scholars, policy makers, and global observers seeking to understand the region's complex dynamics.