Ibiza–Formentera () is one of the 59 constituencies represented in the Senate of Spain, the upper chamber of the Spanish parliament, the . The constituency (whose boundaries correspond to those of the islands of Ibiza and Formentera) elects one senator. The electoral system uses open list partial block voting, with electors voting for individual candidates instead of parties. It was established for the 1977 general election and will be abolished for the 2026 election, when Ibiza and Formentera will form separate constituencies, each electing one senator.

Electoral system The constituency was created as per the Political Reform Law and was first contested in the 1977 general election. The Law provided for the provinces of Spain to be established as multi-member districts in the Senate,. with this regulation being maintained under the Spanish Constitution of 1978.. Additionally, the Constitution requires for any modification of the provincial limits to be approved under an organic law, needing an absolute majority in the Cortes Generales..

Voting is based on universal suffrage, comprising all Spanish nationals over 18 years of age with full political rights, provided that they have not been deprived of the right to vote by a final sentence.. The only exception was in 1977, when this was limited to nationals over 21 years of age and in full enjoyment of their political and civil rights.; . Amendments in 2011 required non-resident citizens to apply for voting, a system known as "begged" voting ().. which was abolished in 2022. Further, amendments in 2018 granted the right to vote to those legally incapacitated. 209 Senate seats (207 in 1977, 208 from 1978 to 2026) are elected using open-list partial block voting: voters in constituencies electing four seats can choose up to three candidates; in those with two or three seats, up to two; and in single-member districts, one. Each of the 47 peninsular provinces is allocated four seats, while in insular provinces—such as the Balearic and Canary Islands—the districts are the islands themselves, with the larger ones (Mallorca, Gran Canaria and Tenerife) being allocated three seats each, and the smaller ones (Menorca, Ibiza, Formentera, Fuerteventura, La Gomera, El Hierro, Lanzarote and La Palma) one each. Ceuta and Melilla elect two seats each.; ; . Until 1985, the law also provided for by-elections to fill Senate seats vacated up to two years into the legislature; subsequently, any vacancies arising after the proclamation of candidates and during the legislative term are filled by the next candidates on the party lists or, when required, by designated substitutes.; .

The electoral law allows for parties and federations registered in the interior ministry, alliances and groupings of electors to present lists of candidates. Parties and federations intending to form an alliance are required to inform the relevant electoral commission within 10 days of the election call—15 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 permille of the electorate, with a compulsory minimum of 500 signatures, until 1985—disallowing electors from signing for more than one list. Also since 2011, parties, federations or alliances that have not obtained a mandate in either chamber of the at the preceding election are required to secure the signature of at least 0.1 percent of electors in the aforementioned constituencies.; . Amendments in 2007 required a balanced composition of men and women in the electoral lists, so that candidates of either sex made up at least 40 percent of the total composition; further amendments in 2024 required the use of a zipper system..

Senators Senators for Ibiza–Formentera 1977– Legislature Election Distribution Constituent 1977 1 1st 1979 1 2nd 1982 1 3rd 1986 1 4th 1989 1 5th 1993 1 6th 1996 1 7th 2000 1 8th 2004 1 9th 2008 1 10th 2011 1 11th 2015 1 12th 2016 1 13th 2019 (Apr) 1 14th 2019 (Nov) 1 15th 2023 1

General elections 2023 + Summary of the 23 July 2023 Senate of Spain election results in Ibiza–Formentera Parties and alliances Popular vote Seats Votes % ±pp Total +/− Ibiza and Formentera in the Senate (PSOE–SMR–EU–Ara Eivissa)1 26,389 45.41 −3.64 1 ±0 People's Party (PP) 23,472 40.39 +13.34 0 ±0 Vox (Vox) 6,607 11.37 −1.36 0 ±0 Zero Cuts (Recortes Cero) 577 0.99 +0.46 0 ±0 Blank ballots 1,070 1.84 +0.12 Total 58,115 1 ±0 Valid votes 58,115 96.80 −0.86 Invalid votes 1,922 3.20 +0.86 Votes cast / turnout 60,037 56.68 +3.67 Abstentions 45,887 43.32 −3.67 Registered voters 105,924 Sources

November 2019 + Summary of the 10 November 2019 Senate of Spain election results in Ibiza–Formentera Parties and alliances Popular vote Seats Votes % ±pp Total +/− Spanish Socialist Workers' Party (PSOE) 15,574 29.07 1 ±0 People's Party (PP) 14,492 27.05 0 ±0 United We Can (Podemos–EUIB) 9,094 16.97 0 ±0 Vox (Vox) 6,822 12.73 0 ±0 Citizens–Party of the Citizenry (Cs) 3,618 6.75 0 ±0 Republican Left (esquerra) 1,612 3.01 New 0 ±0 Animalist Party Against Mistreatment of Animals (PACMA) 1,166 2.18 0 ±0 Zero Cuts–Green Group (Recortes Cero–GV) 283 0.53 0 ±0 Blank ballots 919 1.72 Total 53,581 1 ±0 Valid votes 53,581 97.66 Invalid votes 1,284 2.34 Votes cast / turnout 54,865 53.01 Abstentions 48,638 46.99 Registered voters 103,503 Sources

April 2019

2016

2015

2011

2008

2004

2000

1996

1993

1989

1986 + Summary of the 22 June 1986 Senate of Spain election results in Ibiza–Formentera Candidates Parties and coalitions Popular vote Votes % Alonso Marí Calbet AP–PDP–PL 13,203 44.77 • Jaime Ribas Prats PSOE 11,194 37.96 • Andrés Tuells Juan CDS 2,092 7.09 • Juan Pantaleoni Rosello PRD 929 3.15 • Antonio Planells Tur IU 706 2.39 • Elsa Gluck Rogg VERDE 273 0.93 • Fidel Arcos García MUC 121 0.41 • José Francisco Crespo Albiach UCE 100 0.34 Blank ballots 872 2.96 Total 29,490 Valid votes 29,490 95.95 Invalid votes 1,244 4.05 Votes cast / turnout 30,734 57.94 Abstentions 22,308 42.06 Registered voters 53,042 Sources

1982 + Summary of the 28 October 1982 Senate of Spain election results in Ibiza–Formentera Candidates Parties and coalitions Popular vote Votes % Enrique Ramón Fajarnés AP–PDP 14,849 • María de los Llanos Lozano Guevara PSOE 9,916 • Víctor Ferraz Yagüe UCD 2,316 • Andrés Tuells Juan CDS 1,089 • Antonio Planells Tur PCE 794 • José María Puget Acebo AEPI 0 • Ramón Francisco Martín Gordón FE–JONS 0 Blank ballots Total Valid votes Invalid votes Votes cast / turnout Abstentions Registered voters 43,130 Sources

1979 + Summary of the 1 March 1979 Senate of Spain election results in Ibiza–Formentera Candidates Parties and coalitions Popular vote Votes % Abel Matutes Juan CD 10,265 42.40 • Isidor Marí Mayans CPI 7,763 32.07 • Juan Marí Tur UCD 5,612 23.18 • Guillermo Tuells Riquer PL 220 0.91 • Antonio Ferrer Juan UN 115 0.48 Blank ballots 235 0.97 Total 24,210 Valid votes 24,210 98.20 Invalid votes 443 1.80 Votes cast / turnout 24,653 63.53 Abstentions 14,152 36.47 Registered voters 38,805 Sources

1977 + Summary of the 15 June 1977 Senate of Spain election results in Ibiza–Formentera Parties and alliances Popular vote Seats Votes % ±pp Total +/− People's Alliance (AP) 8,862 38.30 n/a 1 n/a Autonomist Bloc (PSP–PCE–PSD) 6,540 28.27 n/a 0 n/a Union of the Democratic Centre (UCD) 5,585 24.14 n/a 0 n/a Autonomous Movement (MAP) 1,880 8.13 n/a 0 n/a Democratic Union of the Balearic Islands (UDIB) 269 1.16 n/a 0 n/a Blank ballots n/a Total 23,136 1 n/a Valid votes n/a Invalid votes n/a Votes cast / turnout n/a Abstentions n/a Registered voters 35,170 Sources

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