John Stuart Mill’s involvement with the Land Question in Ireland is analyzed from the viewpoint of his theory of institutions. I argue that, for Mill, institutions should promote progress without endangering social order. When referring to economic institutions, “progress” meant, essentially, human improvement, a rise in economic productivity, and the increase of social justice. According to Mill, the cottier system did not fulfill any of these requisites and should be abandoned. Mill also rejected transposing to Ireland the “English model” of capitalist agriculture. This institution could eventually solve the economic problem but involved the unjust eviction of tenants and would not regenerate the Irish character. Given the particularities of Ireland, Mill endorsed peasant property as the most suitable form of land appropriation. It would, at the same time, improve the character of the people, enhance productivity, and increase the social justice of the system. It would also mitigate the conflicts that jeopardized social order.