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Sharp disagreements about social issues have raised concerns about increasing societal polarization in democracies worldwide. While diversity of opinion is vital for democratic engagement and can promote innovative solutions, social science research shows that such disagreements can undermine social cohesion and erode social trust if they turn into identity-based conflicts. The present research examines the potential importance of social norms that promote equality-based respect, dialogue, and unity (inclusivity norms) in mitigating these negative outcomes. In a preregistered, large-scale survey of 12,041 individuals in 12 European countries, we find that perceived inclusivity norms are associated with increased tolerance, greater willingness to collaborate, and lower tendencies to avoid people who hold opposing opinions. In most countries studied, this pattern holds among respondents who strongly disapprove of the opposing viewpoint, endorse antipluralist opinions, hold anti-egalitarian preferences, and identify more strongly with their opinion-based group relative to society. These findings support the potential of inclusivity norms to preserve social trust and cohesion amid opinion diversity.