Contrary to expectations, the EU’s eastward expansion in 2004 did not sound the death knoll of nationalism in the region; rather, it signalled its reinvention and, in some respects, reinvigoration. In this paper, we examine three ways in which nationalism has been redefined in Hungary and Poland in the context of EU enlargement. First, consensus on the desirability of European unification has lessened the importance of left/right party divisions; in its place, the “nation” has provided a fulcrum for inter-party contestation. Second, EU integration has provided nationalists in the region with a backdoor for realising old nationalist ambitions of national reunification across the porous borders of the EU. Third, we examine the way radical nationalist organisations in Hungary and Poland increasingly define themselves in opposition to the EU.