In the run up to the 2015 Spanish general election, various organisations carried out opinion polling to gauge voting intention in constituencies in Spain during the term of the 10th Cortes Generales.
Voting intention estimates refer mainly to a hypothetical Congress of Deputies election.
The highest percentage figure in each polling survey is displayed with its background shaded in the leading party's colour.
The "Lead" columns on the right shows the percentage-point difference between the parties with the highest percentages in a given poll.
Refusals are generally excluded from the party vote percentages, while question wording and the treatment of "don't know" responses and those not intending to vote may vary between polling organisations.