Interculturalism provides the core framework for immigration‐related policies in Catalonia, while remaining deeply intertwined with Catalan nationalism. We first identify ‘intercultural nationalism’ as the core doctrine through which Catalan nationalist discourse has been articulated in relation to immigration. We trace interculturalism's origins to nationalism in Quebec and argue that, in Catalonia also, regional immigration policies have been constructed in opposition to those of the central state, while attempting to involve immigrants closely in subnational belonging and social cohesion. Second, we investigate whether interculturalism is durable during economic and political crises, arguing that intercultural policies did not change following the economic recession of the 2010s. This harmonises with broader interpretations that de‐emphasise the role of economic factors in ethnic conflicts. In conclusion we note how the continuing resilience of interculturalism in Catalan policies on immigration contrasts sharply with the rise of xenophobia elsewhere.