2005 Spanish European Constitution referendum

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National referendums on the
European Constitutional Treaty
Superseded by the Treaty of Lisbon (2007)
Front cover of an edition of the constitutional treaty published and distributed for free by the Spanish government

A referendum on the treaty establishing a Constitution for Europe was held in Spain on 20 February 2005.[1] The consultative referendum on ratification of the proposed Constitution of the European Union was approved by 81.8% of voters, although turnout was just 41.8%,[2] the lowest since the end of the Franco era.[3]

The referendum was not legally binding on the government, but paved the way for parliamentary ratification of the constitutional treaty, which happened in the Congress of Deputies on 28 April 2005, with a result of 319 "Yes" to 19 "No", and in the Upper Chamber on 18 May 2005 with a result of 225 "Yes" to 6 "No" and one abstention.


Both the governing Spanish Socialist Workers' Party (PSOE) and the main opposition People's Party (PP) campaigned for a "Yes" vote. They were joined by the Basque Nationalist Party (EAJ–PNV) and the Catalan nationalist Convergence and Union (CiU). Among the parties campaigning for a "No" vote were United Left (IU), the Bloque Nacionalista Galego (BNG, Galician National Block), Republican Left of Catalonia (ERC), Initiative for Catalonia Greens (ICV), the social democratic Aragonese Council (CHA), the Basque nationalist social democratic Eusko Alkartasuna, and the Trade Unions Confederación Intersindical Galega (CIG) and CGT.

Amidst widespread apathy surrounding the constitutional treaty, and ignorance of its contents (in a government poll, 90% of voters admitted to having little or no knowledge of its provisions), the government hired celebrities to read excerpts from the text in daily television broadcasts, and five million copies (without annexes) were sent out with Sunday papers. While many felt that the result of the referendum was a foregone conclusion, it was feared that turnout could be as low as 40 to 50% of the electorate. This turned out to be the case.

In late January 2005, several bodies campaigning for a "No" vote complained to Spain's independent National Electoral Commission about the government's planned information campaign:

  • On 14 January, ERC demanded that the National Electoral Commission should block what it saw as unfair promotion of the treaty by the government.
  • On 19 January, the Tomás Moro Centre for Juridical Studies (CJSTM) and Another Democracy is Possible complained to the National Electoral Commission about what they saw as the unfair nature of the government’s campaign.

In response to these complaints, the Commission ruled that the government's campaign must be purely informative, and banned several of its campaign slogans:

The campaign to be carried out by the Government as part of the present referendum process must inform objectively on the contents of the Treaty… All value judgements and slogans previously used in TV, on websites and other media, e.g. 'We are first with Europe', and statements that could, direct or indirectly, influence the position or attitude of the citizens, must be removed.


Do you approve the Treaty establishing a Constitution for Europe?

Distribution of "Yes" votes by province.
Distribution of the turnout by province.
Choice Votes %
For 11,057,563 81.8
Against 2,453,002 18.2
Blank ballots 856,664
Invalid votes 124,523
Total 14,491,852 100
Registered voters/turnout 34,692,491 41.8
Source: Nohlen & Stöver, European Election Database


  1. ^ Nohlen, D & Stöver, P (2010) Elections in Europe: A data handbook, p1817 ISBN 978-3-8329-5609-7
  2. ^ Nohlen & Stöver, p1824
  3. ^ Spain's mixed EU signals BBC, 21 February 2005

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