This chapter examines the relationship between European integration and democracy. The continuous transfer of policy-making powers from European Union (EU) member states to the European level has raised serious concerns about democratic legitimacy. The chapter assesses the claims that European integration undermines national democracy, and that decision-making at the EU level is not sufficiently democratic. It argues that while significant challenges remain, European integration has definitely become more democratic over the years. But there is perhaps a trade-off, with stronger input legitimacy potentially an obstacle to efficient European-level decision-making. It also underlines the multilevel nature of the EU polity and the importance of public debates about European integration.