The Group of the Alliance of Liberals and Democrats for Europe (ALDE Group) was the liberal–centrist^[4][5] political group of the European Parliament from 2004 until 2019. It was made up of MEPs from two European political parties, the Alliance of Liberals and Democrats for Europe Party and the European Democratic Party, which collectively form the Alliance of Liberals and Democrats for Europe.

The ALDE Group traced its unofficial origin back to September 1952 and the first meeting of the Parliament's predecessor, the Common Assembly of the European Coal and Steel Community. Founded as an explicitly liberal group, it expanded its remit to cover the different traditions of each new Member State as they acceded to the Union, progressively changing its name in the process. Its immediate predecessor was the European Liberal Democrat and Reform Party Group (ELDR).

The ALDE Group was the fourth-largest group in the Eighth European Parliament term, and previously participated in an informal coalition with the EPP during the Sixth Parliament (2004–2009). The pro-European platform of ALDE was in support of free market economics and pushed for European integration and the European single market.^[6]

On 12 June 2019, it was announced that the successor group in alliance with La République En Marche! would be named Renew Europe.^[7][8]

The ALDE Group traced its unofficial ancestry back to the Liberal members present at the first meeting of the Common Assembly of the European Coal and Steel Community (the Parliament's predecessor) on 10 September 1952,^[9] but the Group was officially founded as the Group of Liberals and Allies^[3] on 23 June 1953.^[3]

As the Assembly grew into the Parliament, the French Gaullists split from the Group on 21 January 1965^[10] and the Group started the process of changing its name to match the liberal/centrist traditions of the new member states, firstly to the Liberal and Democratic Group^[3][11] in 1976,^[3] then to the Liberal and Democratic Reformist Group^[12] on 13 December 1985,^[3] then to the Group of the European Liberal Democrat and Reform Party^[3][11][13] on 19 July 1994^[3] to match the European political party of the same name.

In 1999, the Group partnered with European People's Party–European Democrats (EPP-ED) group to form an informal coalition for the Fifth Parliament. This included supporting the EPP's candidate for President of the Parliament in 1999 and the ALDE candidate in 2002. This meant that the Group secured its first President of the European Parliament since Simone Veil, when Pat Cox was elected to the post to serve the latter half of the Parliament's five-year term. This arrangement was discontinued after the 2009 election, when the EPP and the socialist S&D Group formed an informal Grand Coalition.

On 13 July 2004, the Group approved a recommendation to unite with MEPs from the centrist political party at the European level called the European Democratic Party (EDP) founded by François Bayrou's Union for French Democracy, the Labour Party of Lithuania and Democracy is Freedom – The Daisy of Italy.

The Group accordingly became the Group of the Alliance of Liberals and Democrats for Europe^[3] (ALDE) on 20 July 2004,^[3] to match the eponymous transnational political alliance, although the two European-level parties remained separate outside the European Parliament. The MEP Graham Watson of the British Liberal Democrats became the first chair of ALDE.

In May 2019, speaking at a debate leading up to the 2019 European Parliament election, ALDE President Guy Verhofstadt announced that following the election, the group would form a new, centrist alliance with Emmanuel Macron's "Renaissance" list and be renamed as Renew Europe.^[14]

Along with the other political groups, ALDE has been analysed by academics on its positions regarding various issues. In short, it's a group of cohesive, gender-balanced centrist Euroneutrals that cooperate most closely with the EPP, are ambiguous on hypothetical EU taxes and supportive of eventual full Turkish accession to the European Union.