This chapter focuses on the European Parliament (EP), an institution that has been transformed from being a relatively powerless institution into one that is able to have a genuine say in the legislative process and hold the European Union’s executive bodies to account. However, increases in the Parliament’s formal powers have not been matched by an increase in popular legitimacy: decreasing turnout in European elections up to 2014 turned around in 2019, but an increasing share of the vote is now going to populist Eurosceptic parties. The EP’s legislative power is comparable to that of many national parliaments, but it has struggled to connect with the wider European public. The chapter explores these issues: the EP’s evolution from talking shop to co-legislator; its powers and influence; its internal structure and organization, with a focus on the role and behaviour of the political groups. Finally, the EP’s representative function as the EU’s only directly elected institution is discussed.