The election was won by the Barcelona en Comú (BComú) citizen platform, supported by Podemos, Initiative for Catalonia Greens–United and Alternative Left (ICV–EUiA) and Constituent Process (Procés Constituent) and led by Ada Colau popular activist and former spokeswoman of the Platform for People Affected by Mortgages (PAH).

Incumbent mayor Xavier Trias of the Convergence and Union (CiU) federation, who had campaigned for a second consecutive term in office, saw his support reduced from 14 to 10 out of 41 seats in the council.

Citizens (C's) became the third largest political force in the city, whereas Republican Left of Catalonia (ERC) obtained its second best historical result.

The Popular Unity Candidacy (CUP) also entered the City Council for the first time in history, winning 3 seats and 7.4% of the votes.

[3] 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.