The 54 members of the European Parliament allocated to Spain as per the Treaty of Lisbon were elected using the D'Hondt method and a closed list proportional representation, with no threshold being applied in order to be entitled to enter seat distribution. Seats were allocated to a single multi-member constituency comprising the entire national territory. Voting was on the basis of universal suffrage, which comprised all nationals and resident non-national European citizens over eighteen and in full enjoyment of their political rights. Additionally, Spaniards abroad were required to apply for voting before being permitted to vote, a system known as "begged" or expat vote. The use of the D'Hondt method might result in an effective threshold depending on the district magnitude.
Outgoing delegation
Parties and candidates
The electoral law allowed for parties and federations registered in the interior ministry, coalitions and groupings of electors to present lists of candidates. Parties and federations intending to form a coalition ahead of an election were required to inform the relevant Electoral Commission within ten days of the election call. In order to be entitled to run, parties, federations, coalitions and groupings of electors needed to secure the signature of at least 15,000 registered electors; this requirement could be lifted and replaced through the signature of at least 50 elected officials—deputies, senators, MEPs or members from the legislative assemblies of autonomous communities or from local city councils. Electors and elected officials were disallowed from signing for more than one list of candidates. Below is a list of the main parties and electoral alliances which contested the election:
Campaign
Party slogans
Election debates
Opinion polls
The table below lists voting intention estimates in reverse chronological order, showing the most recent first and using the dates when the survey fieldwork was done, as opposed to the date of publication. Where the fieldwork dates are unknown, the date of publication is given instead. The highest percentage figure in each polling survey is displayed with its background shaded in the leading party's colour. If a tie ensues, this is applied to the figures with the highest percentages. The "Lead" column on the right shows the percentage-point difference between the parties with the highest percentages in a given poll. When available, seat projections are also displayed below the voting estimates in a smaller font.
Results
Overall
Distribution by European group
Elected legislators
The following table lists the elected legislators: