All 61 seats allocated to Spain as per the Treaty of Lisbon and the 2023 Council Decision establishing the composition of the European Parliament were up for election.

Far-right Vox increased its count by three points and two seats to just below 10% and 6, whereas the left-wing vote split between Yolanda Díaz's Sumar alliance and former minister Irene Montero's Podemos.

The election was notable for the surprise performance of social media polemicist Alvise Pérez's right-wing Se Acabó La Fiesta (Spanish for "The Party Is Over"), which scored in sixth place just below Sumar.

The aftermath of the election saw the resignation of Yolanda Díaz as Sumar's leader over her alliance's disappointing results and in Vox leaving the European Conservatives and Reformists (ECR) to join Viktor Orbán's new Patriots for Europe grouping.

[a][3][4] Voting was on the basis of universal suffrage, which comprised all nationals and resident non-national European citizens over 18 years of age and in full enjoyment of their political rights.

The table below lists opinion polling on the victory preferences for each party in the event of a European Parliament election taking place.

The table below lists opinion polling on the perceived likelihood of victory for each party in the event of a European Parliament election taking place.