This paper examines the role of national identity in sustaining public support for the welfare state. Liberal nationalist theorists argue that social justice will always be easier to achieve in states with strong national identities, which, they contend, can both mitigate opposition to redistribution among high-income earners and reduce any corroding effects of ethnic diversity resulting from immigration. We test these propositions with Canadian data from the Equality, Security and Community survey. We conclude that national identity does increase support for the welfare state among the affluent majority of Canadians and that it helps to protect the welfare state from toxic effects of cultural suspicion. However, we also find that identity plays a narrower role than existing theories of liberal nationalism suggest and that the mechanisms through which it works are different. This leads us to suggest an alternative theory of the relationship between national identity and the welfare state, one that suggests that the relationship is highly contingent, reflecting distinctive features of the history and national narratives of each country. National identity may not have any general tendency to strengthen support for redistribution, but it may do so for those aspects of the welfare state seen as having played a particularly important role in building the nation or in enabling it to overcome particular challenges or crises. Cet article examine le role de l'identite nationale en matiere d'appui populaire a l'Etat-providence. Les theoriciens du nationalisme liberal soutiennent que la justice sociale sera toujours plus facile a realiser dans les Etats ayant une forte identite nationale, laquelle, selon eux, peut a la fois attenuer l'opposition a la redistribution chez les personnes a revenu eleve et reduire les effets corrosifs de la diversite ethnique engendree par l'immigration. Nous evaluons ces propositions a la lumiere des donnees canadiennes de l'Etude sur l'egalite, la securite et la communaute. Nous concluons que l'identite nationale augmente effectivement l'appui envers l'Etat-providence parmi les Canadiens fortunes de la majorite, et qu'elle aide a proteger l'Etat-providence contre les effets toxiques de la suspicion culturelle. Cependant, nous constatons egalement que l'identite joue un role plus restreint que ne le suggerent les theories existantes du nationalisme liberal et que ses mecanismes de fonctionnement sont differents. Cela nous amene a proposer une autre theorie de la relation entre l'identite nationale et l'Etat-providence, une theorie selon laquelle cette relation est fortement contingente et reflete les caracteristiques propres de l'histoire et de la tradition nationale de chaque pays. L'identite nationale n'a peutetre, en soi, aucune tendance generale a renforcer l'appui a la redistribution, mais elle peut le faire pour les aspects de l'Etat-providence consideres comme ayant joue un role particulierement important dans l'edification de la nation, ou lui ayant permis de surmonter des crises ou des defis particuliers. doi: 10.1017/S0008423910000089