Anthony D. Smith, in one of his earlier, less debated, works – Nationalism in the 20th Century (1979) – examines phases of nationalism in the modern era, suggesting that nationalism has taken various forms before and during the 20th century. He argues that nationalism’s adaptability is at the core of its persistence, adapting to changing situations such as fascism and communism. As a result of this adaptability, nationalism still flourishes today. This article applies Smith’s theory to explore the interplay between cultural and material factors in the evolution of nationalism in Ireland. It identifies five ideological phases – revolutionary nationalist, protectionist, liberalising, neoliberal, and ecological – to which nationalism has adapted, and within which nationalism has influenced various aspects of Irish society. These phases are situated within a broader ideological and material context, analysing obliquely the Irish language (a core element of Irish nationalism), and related to changing processes of individualization.