This chapter examines the pattern of Poland’s relations with the European Union during the period 1989–2011. Poland took an early decision in 1989 to place European integration at the centre of its plans for democratization and modernization. Post-accession opinion in Poland on the EU was initially divided between an increasingly Europhile public and an occasionally Eurosceptic political class. By the time of the Polish Presidency of the EU in 2011, however, Poland had largely shed its reputation for awkwardness and had achieved a few policy successes, particularly in relations with its Eastern neighbours. The chapter explains how Poland came to join the EU and assesses the impact of its EU membership on domestic politics, public opinion, institutions, governance, and public policy. It concludes by considering the re-emergent divide between elite and public attitudes since the 2015 elections and tensions with the EU over the rule of law.