AbstractParty political conflict plays an essential role in shaping welfare policies, while they are simultaneously also shaped by these policies. As political parties grapple with the wicked challenges of our times, new forms of solidarity and solidarity conflicts arise across welfare regimes. Despite their significance, these dynamics have not received much recent attention. Our article aims to fill this gap. Through content analysis of party manifestos, we compare the solidarity frames of political parties within and between three distinct welfare regimes—Flanders (Belgium), Sweden, and the United States. Our results confirm our expectations drawn from political feedback literature: while party ideology influences parties' solidarity frame preferences and solidarity conflicts between parties, these preferences and conflicts are also influenced by a welfare regime's societal solidarity norms. Our article highlights the value of analyzing solidarity frames and political solidarity conflicts within welfare‐state regimes to better understand welfare politics and policies.Related ArticlesKönig, Pascal D. 2015. “Moral Societal Renewal or Getting the Country Back to Work: Welfare State Culture as a Resource and a Constraint for Policy Discourse.” Politics & Policy 43(5): 647–78. https://doi.org/10.1111/polp.12130.Mioni, Michele, 2021. “The ‘Good Citizen’ as a ‘Respectable Worker:’ State, Unemployment, and Social Policy in the United Kingdom and Italy, 1930 to 1950.” Politics & Policy 49(4): 913–39. https://doi.org/10.1111/polp.12425.Wagle, Udaya R. 2014. “The Heterogeneity Politics of the Welfare State: Changing Population Heterogeneity and Welfare State Policies in High‐Income OECD Countries, 1980‐2005.” Politics & Policy 41(6): 947–84. https://doi.org/10.1111/polp.12053.