Legislative elections were held in Argentina on 26October 2025. Nearly half of the seats in the Chamber of Deputies (127 of 257) and a third of the seats in the Senate (24 of 72) were contested.

The elections resulted in a decisive victory for incumbent president Javier Milei's party, with La Libertad Avanza (under a single ballot line with Republican Proposal and other smaller parties) winning 64 seats, totalling 95 seats in the Chamber of Deputies. The opposition Homeland Force won 47 seats for a total of 100 seats. The United Provinces, a newly formed coalition of regional and centrist politicians, decreased to a total of 21 seats, and the Workers' Left Front won 3 seats for a total of 4. Other smaller parties won the remaining 5. Turnout reached a record low in modern Argentine history, at 67.43%, despite compulsory voting.

Background These midterm elections were the first during the presidency of Javier Milei; his libertarian economic reform agenda was top of mind for many voters. The election took place in the aftermath of the 2025 elections in the 2025 Buenos Aires provincial election in which Homeland Force of Governor Axel Kicillof achieved a resounding victory in the province obtaining 47% of the vote compared to 33% of La Libertad Avanza. The results featured the Peronist alliance far over performing polls. As a result of the election, the Argentine Peso lost 5% against the dollar and Argentine stocks slid around 15%.

During a 14October White House meeting with Milei, US president Donald Trump conditioned a US$20billion currency swap (in which two governments agree to trade currencies at a fixed rate rather than on the open market) on the electoral success of Milei's party La Libertad Avanza in the election. Trump stated, "If [Milei] doesn't win, we're gone", and that "If [Milei] loses, we are not going to be generous with Argentina." The next day, US Treasury Secretary Scott Bessent told reporters that an additional US$20billion in financial aid could be provided to Argentina through sovereign funds and investments from private banks. The deal was widely reported as a bailout that prevented Argentina from going into default. The Central Bank of Argentina announced the signature of the first US$20 billion currency swap agreement on 20 October.

Electoral system

The 2025 elections were the first in which the unified paper ballot (in , BUP) system was used, following a 2024 reform of the electoral law. It was also be the first time at the national level since the 2011 Argentine general election without Open, Mandatory and Simultaneous Primaries (PASO); the PASO primary election system was suspended ahead of the 2025 contest but was still legally in place.

Chamber of Deputies

The 257 members of the Chamber of Deputies are elected by proportional representation in 24 multi-member constituencies based on the provinces (plus the City of Buenos Aires). Seats are allocated using the d'Hondt method, with a 3% electoral threshold. In the 2025 election, 127 of the 257 seats were up for renewal for a four-year term.

Province Seats Seatsat stake Buenos Aires 70 35 City of Buenos Aires 25 13 Catamarca 5 3 Chaco 7 4 Chubut 5 2 Córdoba 18 9 Corrientes 7 3 Entre Ríos 9 5 Formosa 5 2 Jujuy 6 3 La Pampa 5 3 La Rioja 5 2 Mendoza 10 5 Misiones 7 3 Neuquén 5 3 Río Negro 5 2 Salta 7 3 San Juan 6 3 San Luis 5 3 Santa Cruz 5 3 Santa Fe 19 9 Santiago del Estero 7 3 Tierra del Fuego 5 2 Tucumán 9 4 Total 257 127

Outgoing deputies Province Deputy Party Seeking re-election Buenos Aires Union for the Homeland Buenos Aires Union for the Homeland Buenos Aires PRO Buenos Aires Civic Coalition ARI Buenos Aires Civic Coalition ARI Buenos Aires PRO Buenos Aires Workers' Left Front–Unity Buenos Aires Workers' Left Front–Unity Buenos Aires La Libertad Avanza Buenos Aires PRO Buenos Aires Union for the Homeland Buenos Aires Union for the Homeland Buenos Aires Union for the Homeland Buenos Aires Civic Coalition ARI Buenos Aires Union for the Homeland Buenos Aires Democracy Forever Buenos Aires PRO Buenos Aires Federal Encounter Buenos Aires Union for the Homeland Buenos Aires Union for the Homeland Buenos Aires Union for the Homeland Buenos Aires Union for the Homeland Buenos Aires Union for the Homeland Buenos Aires La Libertad Avanza Buenos Aires Union for the Homeland Buenos Aires Radical Civic Union Buenos Aires Federal Encounter Buenos Aires PRO Buenos Aires PRO Buenos Aires Union for the Homeland Buenos Aires PRO Buenos Aires Federal Encounter Buenos Aires Democracy Forever Buenos Aires Union for the Homeland Buenos Aires Union for the Homeland City of Buenos Aires PRO City of Buenos Aires La Libertad Avanza City of Buenos Aires Workers' Left Front–Unity City of Buenos Aires Democracy Forever City of Buenos Aires La Libertad Avanza City of Buenos Aires Union for the Homeland City of Buenos Aires PRO City of Buenos Aires United Republicans City of Buenos Aires Union for the Homeland City of Buenos Aires Civic Coalition ARI City of Buenos Aires Union for the Homeland City of Buenos Aires Democracy Forever City of Buenos Aires PRO Catamarca Union for the Homeland Catamarca Union for the Homeland Catamarca League of the Interior Chaco Union for the Homeland Chaco Union for the Homeland Chaco Democracy Forever Chaco PRO Chubut Union for the Homeland Chubut PRO Córdoba Federal Encounter Córdoba PRO Córdoba Radical Civic Union Córdoba Radical Civic Union Córdoba Union for the Homeland Córdoba Federal Encounter Córdoba Radical Civic Union Córdoba Federal Encounter Córdoba PRO Córdoba PRO Corrientes Democracy Forever Corrientes PRO Corrientes Union for the Homeland Entre Ríos Democracy Forever Entre Ríos Democracy Forever Entre Ríos Union for the Homeland Entre Ríos PRO Entre Ríos Union for the Homeland Formosa Democracy Forever Formosa Union for the Homeland Jujuy Union for the Homeland Jujuy Radical Civic Union Jujuy Workers' Left Front–Unity La Pampa PRO La Pampa Union for the Homeland La Rioja Union for the Homeland La Rioja Union for the Homeland Mendoza Union for the Homeland Mendoza Radical Civic Union Mendoza La Libertad Avanza Mendoza Union for the Homeland Mendoza Radical Civic Union Misiones League of the Interior Misiones Federal Innovation Misiones La Libertad Avanza Neuquén Union for the Homeland Neuquén League of the Interior Neuquén Neuquén People's Movement Río Negro Federal Innovation Río Negro PRO Salta Federal Innovation Salta Union for the Homeland Salta La Libertad Avanza San Juan Union for the Homeland San Juan Union for the Homeland San Juan Production and Labour San Luis La Libertad Avanza San Luis PRO San Luis Union for the Homeland Santa Cruz For Santa Cruz Santa Cruz Union for the Homeland Santa Cruz Radical Civic Union Santa Fe United Santa Fe Future and Freedom Santa Fe Federal Encounter Santa Fe PRO Santa Fe Democracy Forever Santa Fe PRO Santa Fe Union for the Homeland Santa Fe Union for the Homeland Santa Fe Union for the Homeland Santiago del Estero Union for the Homeland Santiago del Estero Union for the Homeland Santiago del Estero Union for the Homeland Tierra del Fuego La Libertad Avanza Tierra del Fuego Union for the Homeland Tucumán Independence Tucumán Independence Tucumán CREO Tucumán Radical Civic Union

Senate

The 72 members of the Senate are elected in the same 24 provinces, with three seats in each. The party receiving the most votes in each constituency wins two seats, with the third seat awarded to the second-placed party. In this election, one-third of senate seats were up for election, namely those for the eight provinces of Chaco, Entre Ríos, Neuquén, Río Negro, Salta, Santiago del Estero, Tierra del Fuego, and the City of Buenos Aires.

Outgoing senators Province Senator Party Seeking re-election City of Buenos Aires Radical Civic Union City of Buenos Aires Union for the Homeland City of Buenos Aires PRO Chaco Union for the Homeland Chaco Union for the Homeland Chaco Radical Civic Union Entre Ríos Union for the Homeland Entre Ríos PRO Entre Ríos Radical Civic Union Neuquén Neuquén People's Movement Neuquén Union for the Homeland Neuquén Union for the Homeland Río Negro Union for the Homeland Río Negro Union for the Homeland Río Negro Together We Are Río Negro Salta Union for the Homeland Salta Union for the Homeland Salta Federal Change Santiago del Estero Union for the Homeland Santiago del Estero Union for the Homeland Santiago del Estero Union for the Homeland Tierra del Fuego Radical Civic Union Tierra del Fuego Union for the Homeland Tierra del Fuego Union for the Homeland

Opinion polls Polling chart Opinion polling for the 2025 Argentine legislative election using Local regression (LOESS) of polls conducted. Kirchnerism and Federal Peronism entries were merged into UXP.

2025

Polling firmFieldwork dateSample sizeFuerza Patria Federal PeronismOthersUndecidedLeadFixer26–31 May 202527744032—65—8118Giacobbe26 May–2 June 2025250040.926.34.55.91.83—10.414.6UdeSA21–29 May 202510052924734—175Isasi/Burdman20–27 May 2025250042238432019Delfos15–22 May 2025235338.130.64.98.11.63.92.85.17.5Pulso Research5–11 May 2025200030.518.57.67.12.23.9624.212Isasi/BurdmanApril 2025—352110542514Analogías26–28 April 2025275829.9 29.711.45.46.43.813.40.2Management & Fit14–28 April 2025260036.925.910.19.14.12.74.55.111Tendencias18–23 April 20259490 36.133.72.19.22.45.7—10.82.4Zuban Córdoba16–19 April 2025160034.834.44.56.11.73.1—16.60.4Delfos11–14 April 2025241135.531.33.48.63.14.93.6 5.14.2Pulso Research2–9 April 2025180029.822.16.37.22.65.46.120.67.7Proyección Consultores29 March–4 April 2025239729.331.7—6.43.72.91.924.22.4Tendencias29 March–4 April 20258865 36.834.62.411.15.6—9.52.2Analogías28–31 March 20252864 30.830.2—10.85.34.3—18.60.6Opina Argentina1–4 March 20252085 38324744376Analogías25–28 February 20252733 33.130.4—10.63.634.614.92.7Tendencias24–28 February 202511077 40.935.11.98.25.8—8.15.8PoliarquíaFebruary 2025—3616993921720Isasi/BurdmanFebruary 2025— 37101112432325Proyección Consultores17–22 February 2025202928.817.915.45.83.32.22.723.910.9Management & Fit10–21 February 2025220041.626.79.46.42.63.53.16.614.9Pulso Research1–7 February 2025177731.418.45.46.33.34.59.421.213ArescoJanuary 2025—47.236.1—7.96—2.8—11.1Isasi/BurdmanJanuary 2025—36912104342124Management & Fit10–21 January 2025—42.126.59.871.82.83715.6Analogías19–23 January 2025264533.631.1—8.74.44.4—17.82.5Pulso Research6–12 January 2025190030.215.9753.648.226.114.3

2024