Barcelona is one of the four constituencies () represented in the Parliament of Catalonia, the regional legislature of the autonomous community of Catalonia. The constituency currently elects 85 deputies. Its boundaries correspond to those of the Spanish province of Barcelona. The electoral system uses the D'Hondt method and closed-list proportional representation, with a minimum threshold of three percent.

Electoral system The constituency was created as per the Statute of Autonomy of Catalonia of 1979 and was first contested in the 1980 regional election. The Statute requires for an electoral law to be passed by a two-thirds supermajority in the Parliament of Catalonia, but transitory provisions provide for the four provinces in Catalonia—Barcelona, Girona, Lleida and Tarragona—to be established as multi-member districts in the Parliament. Each constituency is allocated a fixed number of seats: 85 for Barcelona, 17 for Girona, 15 for Lleida and 18 for Tarragona.

Voting is on the basis of universal suffrage, which comprises all nationals over eighteen, registered in Catalonia and in full enjoyment of their political rights. Amendments to the electoral law in 2011 required for Catalans abroad to apply for voting before being permitted to vote, a system known as "begged" or expat vote () which was abolished in 2022. Seats are elected using the D'Hondt method and a closed list proportional representation, with an electoral threshold of three percent of valid votes—which includes blank ballots—being applied in each constituency. The use of the D'Hondt method may result in a higher effective threshold, depending on the district magnitude.

The electoral law allows 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 are required to inform the relevant Electoral Commission within ten days of the election call—fifteen before 1985—whereas groupings of electors need to secure the signature of at least one percent of the electorate in the constituencies for which they seek election—one-thousandth of the electorate, with a compulsory minimum of 500 signatures, until 1985—disallowing electors from signing for more than one list of candidates.

Deputies Deputies 1980–present Parliament Election Distribution 1st 1980 20 8 2 22 26 7 2nd 1984 5 3 29 41 7 3rd 1988 8 3 28 3 39 4 4th 1992 6 6 27 41 5 5th 1995 10 7 22 34 12 6th 1999 3 7 36 31 8 7th 2003 7 13 29 25 11 8th 2006 9 11 25 3 27 10 9th 2010 8 6 18 3 3 35 12 10th 2012 3 10 12 14 8 26 12 11th 2015 7 32 9 12 17 8 12th 2017 3 7 18 13 17 24 3 13/14th 2021 5 7 19 23 16 5 3 7 15th 2024 3 6 12 28 18 11 7

Regional elections 2024 + Summary of the 12 May 2024 Parliament of Catalonia election results in Barcelona Parties and alliances Popular vote Seats Votes % ±pp Total +/− Socialists' Party of Catalonia (PSC–PSOE) 707,234 29.88 +4.84 28 +5 Together+Carles Puigdemont for Catalonia (Cat–Junts+) 457,744 19.34 +1.42 18 +2 Republican Left of Catalonia (ERC) 316,212 13.36 –7.06 12 –7 People's Party (PP) 274,054 11.58 +7.53 11 +8 Vox (Vox) 188,828 7.98 +0.18 7 ±0 Commons Unite (Comuns Sumar)1 158,343 6.69 –1.07 6 –1 Popular Unity Candidacy–Let's Defend the Land (CUP–DT) 94,123 3.98 –2.33 3 –2 Catalan Alliance (Aliança.cat) 67,896 2.87 New 0 ±0 Animalist Party with the Environment (PACMA) 28,067 1.19 New 0 ±0 Citizens–Party of the Citizenry (Cs) 19,633 0.83 –5.27 0 –5 At the Same Time (Alhora)2 10,627 0.45 +0.24 0 ±0 Workers' Front (FO) 8,218 0.35 New 0 ±0 Communist Party of the Workers of Catalonia (PCTC) 3,267 0.14 –0.03 0 ±0 Zero Cuts (Recortes Cero) 2,835 0.12 –0.40 0 ±0 For a Fairer World (PUM+J) 2,049 0.09 New 0 ±0 Left for Spain (IZQP–Unidos–DEf)3 1,706 0.07 –0.02 0 ±0 Blank ballots 25,873 1.09 +0.28 Total 2,366,709 85 ±0 Valid votes 2,366,709 99.27 +0.55 Invalid votes 17,510 0.73 –0.55 Votes cast / turnout 2,384,219 55.72 +4.32 Abstentions 1,894,848 44.28 –4.32 Registered voters 4,279,067 Sources

2021 + Summary of the 14 February 2021 Parliament of Catalonia election results in Barcelona Parties and alliances Popular vote Seats Votes % ±pp Total +/− Socialists' Party of Catalonia (PSC–PSOE) 533,051 25.04 +9.89 23 +10 Republican Left of Catalonia (ERC) 434,685 20.42 –0.21 19 +1 Together for Catalonia (JxCat)1 381,541 17.92 n/a 16 +4 Vox (Vox) 166,166 7.80 New 7 +7 In Common We Can–We Can In Common (ECP–PEC)2 165,304 7.76 –0.66 7 ±0 Popular Unity Candidacy–A New Cycle to Win (CUP–G) 134,265 6.31 +1.94 5 +2 Citizens–Party of the Citizenry (Cs) 129,889 6.10 –20.33 5 –19 People's Party (PP) 86,266 4.05 –0.30 3 ±0 Catalan European Democratic Party (PDeCAT)1 53,378 2.51 n/a 0 –5 Zero Cuts–Green Group–Municipalists (Recortes Cero–GV–M) 10,981 0.52 +0.26 0 ±0 Primaries for the Independence of Catalonia Movement (MPIC) 4,405 0.21 New 0 ±0 Communist Party of the Workers of Catalonia (PCTC) 3,557 0.17 New 0 ±0 National Front of Catalonia (FNC) 3,247 0.15 New 0 ±0 Nationalist Party of Catalonia (PNC) 3,147 0.15 New 0 ±0 Left in Positive (IZQP) 1,904 0.09 New 0 ±0 Blank ballots 17,194 0.81 +0.38 Total 2,128,980 85 ±0 Valid votes 2,128,980 98.72 –0.95 Invalid votes 27,560 1.28 +0.95 Votes cast / turnout 2,156,540 51.40 –27.92 Abstentions 2,038,926 48.60 +27.92 Registered voters 4,195,466 Sources

2017 + Summary of the 21 December 2017 Parliament of Catalonia election results in Barcelona Parties and alliances Popular vote Seats Votes % ±pp Total +/− Citizens–Party of the Citizenry (Cs) 868,365 26.43 +7.59 24 +7 Republican Left–Catalonia Yes (ERC–CatSí)1 678,030 20.63 n/a 18 +3 Together for Catalonia (JuntsxCat)1 624,261 19.00 n/a 17 +1 Socialists' Party of Catalonia (PSC–PSOE) 497,650 15.15 +1.48 13 +1 Catalonia in Common–We Can (CatComú–Podem)2 276,810 8.42 –1.71 7 –2 Popular Unity Candidacy (CUP) 143,711 4.37 –3.91 3 –4 People's Party (PP) 142,934 4.35 –4.50 3 –5 Animalist Party Against Mistreatment of Animals (PACMA) 31,330 0.95 +0.17 0 ±0 Zero Cuts–Green Group (Recortes Cero–GV) 8,621 0.26 –0.14 0 ±0 Republican Dialogue (Diàleg) 0 0.00 New 0 ±0 Together for Yes (Independents) (JxSí)1 n/a n/a n/a 0 –1 Blank ballots 14,163 0.43 –0.07 Total 3,285,875 85 ±0 Valid votes 3,285,875 99.67 ±0.00 Invalid votes 10,925 0.33 ±0.00 Votes cast / turnout 3,296,800 79.32 +4.29 Abstentions 859,509 20.68 –4.29 Registered voters 4,156,309 Sources

2015 + Summary of the 27 September 2015 Parliament of Catalonia election results in Barcelona Parties and alliances Popular vote Seats Votes % ±pp Total +/− Together for Yes (JxSí)1 1,112,922 36.09 –4.71 32 –6 Citizens–Party of the Citizenry (C's) 581,032 18.84 +10.41 17 +9 Socialists' Party of Catalonia (PSC–PSOE) 421,487 13.67 –1.73 12 –2 Catalonia Yes We Can (CatSíqueesPot)2 312,527 10.13 –1.01 9 –1 People's Party (PP) 272,804 8.85 –4.42 8 –4 Popular Unity Candidacy (CUP) 255,328 8.28 +4.87 7 +4 Democratic Union of Catalonia (unio.cat) 75,700 2.45 New 0 ±0 Animalist Party Against Mistreatment of Animals (PACMA) 24,426 0.78 +0.18 0 ±0 Zero Cuts–The Greens (Recortes Cero–EV) 12,329 0.40 New 0 ±0 Blank ballots 15,493 0.50 –0.89 Total 3,084,048 85 ±0 Valid votes 3,084,048 99.67 +0.52 Invalid votes 10,314 0.33 –0.52 Votes cast / turnout 3,094,362 75.03 +7.03 Abstentions 1,029,987 24.97 –7.03 Registered voters 4,124,349 Sources

2012 + Summary of the 25 November 2012 Parliament of Catalonia election results in Barcelona Parties and alliances Popular vote Seats Votes % ±pp Total +/− Convergence and Union (CiU) 765,330 28.08 –8.72 26 –9 Socialists' Party of Catalonia (PSC–PSOE) 419,779 15.40 –3.79 14 –4 People's Party (PP) 361,656 13.27 +0.40 12 ±0 Republican Left of Catalonia–Catalonia Yes (ERC–CatSí) 346,662 12.72 +6.36 12 +6 Initiative for Catalonia Greens–United and Alternative Left (ICV–EUiA) 303,625 11.14 +2.88 10 +2 Citizens–Party of the Citizenry (C's) 229,746 8.43 +4.59 8 +5 Popular Unity Candidacy–Left Alternative (CUP) 92,794 3.41 New 3 +3 Platform for Catalonia (PxC) 51,403 1.89 –0.56 0 ±0 Catalan Solidarity for Independence (SI) 32,296 1.19 –1.91 0 –3 Blank Seats (EB) 22,817 0.84 +0.23 0 ±0 Animalist Party Against Mistreatment of Animals (PACMA) 16,479 0.60 +0.11 0 ±0 Pirates of Catalonia (Pirata.cat) 15,241 0.56 +0.35 0 ±0 Union, Progress and Democracy (UPyD) 12,147 0.45 +0.25 0 ±0 Hartos.org (Hartos.org) 9,185 0.32 New 0 ±0 Democratic Way (VD) 5,984 0.16 New 0 ±0 Communist Unification of Spain (UCE) 1,998 0.07 +0.04 0 ±0 Blank ballots 37,999 1.39 –1.52 Total 2,725,141 85 ±0 Valid votes 2,725,141 99.15 –0.22 Invalid votes 23,341 0.85 +0.22 Votes cast / turnout 2,748,482 68.00 +9.12 Abstentions 1,293,428 32.00 –9.12 Registered voters 4,041,910 Sources

2010 + Summary of the 28 November 2010 Parliament of Catalonia election results in Barcelona Parties and alliances Popular vote Seats Votes % ±pp Total +/− Convergence and Union (CiU) 862,010 36.80 +6.91 35 +8 Socialists' Party of Catalonia (PSC–PSOE) 449,549 19.19 –8.71 18 –7 People's Party (PP) 301,440 12.87 +1.71 12 +2 Initiative for Catalonia Greens–United and Alternative Left (ICV–EUiA) 193,545 8.26 –2.12 8 –1 Republican Left of Catalonia (ERC) 148,973 6.36 –6.25 6 –5 Citizens–Party of the Citizenry (C's) 89,990 3.84 +0.31 3 ±0 Catalan Solidarity for Independence (SI) 72,693 3.10 New 3 +3 Platform for Catalonia (PxC) 57,381 2.45 New 0 ±0 Independence Rally (RI.cat) 23,185 0.99 New 0 ±0 Blank Seats–Citizens for Blank Votes (EB–CenB)1 14,185 0.61 +0.36 0 ±0 The Greens–European Green Group (EV–GVE) 12,087 0.52 –0.28 0 ±0 Anti-Bullfighting Party Against Mistreatment of Animals (PACMA) 11,593 0.49 –0.01 0 ±0 From Below (Des de Baix) 5,613 0.24 New 0 ±0 Pirates of Catalonia (Pirata.cat) 5,001 0.21 New 0 ±0 Union, Progress and Democracy (UPyD) 4,634 0.20 New 0 ±0 Reus Independent Coordinator (CORI) 4,425 0.19 New 0 ±0 Pensioners in Action Party (PDLPEA) 2,508 0.11 New 0 ±0 Communist Party of the Catalan People (PCPC) 2,262 0.10 –0.06 0 ±0 Government Alternative (AG) 2,208 0.09 New 0 ±0 For a Fairer World (PUM+J) 1,774 0.08 New 0 ±0 Family and Life Party (PFiV) 1,624 0.07 –0.02 0 ±0 Internationalist Socialist Workers' Party (POSI) 1,399 0.06 –0.12 0 ±0 Spanish Phalanx of the CNSO (FE de las JONS) 1,250 0.05 New 0 ±0 Left Republican Party–Republican Left (PRE–IR) 1,101 0.05 New 0 ±0 Castilian Party (PCAS) 1,066 0.05 New 0 ±0 Humanist Party (PH) 856 0.04 –0.06 0 ±0 Communist Unification of Spain (UCE) 726 0.03 New 0 ±0 Our People (GN) 597 0.03 New 0 ±0 Republican Social Movement (MSR) 490 0.02 –0.01 0 ±0 Blank ballots 68,241 2.89 +0.85 Total 2,342,406 85 ±0 Valid votes 2,342,406 99.37 –0.24 Invalid votes 14,857 0.63 +0.24 Votes cast / turnout 2,357,263 58.88 +2.94 Abstentions 1,646,488 41.12 –2.94 Registered voters 4,003,751 Sources

2006