[2] Voting for the local assembly was on the basis of universal suffrage, which comprised all nationals over 18 years of age, registered and residing in the municipality of Barcelona and in full enjoyment of their political rights, as well as resident non-national European citizens and those whose country of origin allowed Spanish nationals to vote in their own elections by virtue of a treaty.

[1][2] Councillors were allocated to municipal councils based on the following scale: The mayor was indirectly elected by the plenary assembly.

The highest percentage figure in each polling survey is displayed with its background shaded in the leading party's colour.

The "Lead" column on the right shows the percentage-point difference between the parties with the highest percentages in a poll.

Poll conducted after legal ban on opinion polls At the first meeting of the council on 17 June 2023, Jaume Collboni of the PSC was elected as the new Mayor of Barcelona after receiving the support of his own party, Barcelona en Comú and the PP for a total of 23 votes, above the threshold of 21 votes required for the mayorality not to be automatically assumed by Xavier Trias as the leader of the most-voted candidature.