The European Parliament (unofficially also European Parliament or EU Parliament; short EP; lat. Parlamentum Europaeum) with official seat in Strasbourg is the parliament of the European Union (Art. 14 EU Treaty). Since 1979, it has been elected every five years (most recently in 2019) by the citizens of the EU in general, direct, free, secret, but not equal European elections. This makes the European Parliament the only directly elected body of the European Union and the only directly elected supranational institution in the world.

Since the establishment of the Parliament in 1952, its powers in EU law-making have been significantly extended several times, most notably by the Maastricht Treaty in 1992 and most recently by the Lisbon Treaty in 2007, which entered into force on 1 December 2009. Parliament's rights have also been gradually extended with regard to the formation of the executive, i.e. the election of the European Commission. Thus, candidates for the EU Commission must first undergo a hearing in the European Parliament and prove their suitability and ability for the proposed office. This hearing is usually conducted by the relevant committee of the European Parliament and all hearings are also made public via web-stream on the European Parliament's website. Only after successfully passing the hearing can the candidate be elected as a member of the EU Commission, again by the European Parliament (plenary).

The European Parliament lacks the typical opposition between government and opposition factions. Unlike in most national parliaments, where the government groups are usually loyal to the government and support its bills in principle, changing majorities form in the European Parliament depending on the voting topic. This also means that individual MEPs are more independent and have greater influence on EU legislation through their negotiating skills and expertise than is possible for members of national parliaments. In its judgment on the Lisbon Treaty of 30 June 2009, the Federal Constitutional Court grants the European Parliament only limited democratic legitimacy and sees its decision-making powers with regard to further steps towards European integration as limited as a result.

Since the 2014 European elections, the Parliament has comprised a maximum of 750 seats plus the President, i.e. 751 MEPs (Article 14(2) of the EU Treaty). The Parliament currently has seven political groups and 38 non-attached Members. In their home countries, these MEPs are members of around 200 different national parties, most of which have joined together at European level to form European parties.

President of the European Parliament since 3 July 2019 is David Sassoli (S&D). In addition to Strasbourg, the European Parliament's places of work are Brussels and Luxembourg. The Rules of Procedure of the European Parliament contain regulations on the organisation and functioning of the European Parliament.

With the withdrawal of the United Kingdom from the European Union on 31 January 2020 (the so-called "Brexit"), the number of mandates allocated per member state changed. Of the 73 UK parliamentary seats, 27 vacant seats were redistributed among EU countries in proportion to their population. 46 seats were put in reserve for a possible EU enlargement.