2025 Argentine legislative election

Legislative elections are scheduled to be held in Argentina on 26 October 2025.^[1] Half of the seats in the Chamber of Deputies and a third of the seats in the Senate will be elected.^[2]

2025 Argentine legislative election

← 2023 26 October 2025 2027 →

Chamber of Deputies

127 of the 257 seats in the Chamber of Deputies

Party Leader Current seats UP Germán Martínez LLA Gabriel Bornoroni PRO Cristian Ritondo UCR Rodrigo de Loredo Hacemos Juan Schiaretti FIT – Unidad Nicolás del Caño Por Santa Cruz Sergio Acevedo

Senate

24 of 72 seats in the Senate

Party Leader Current seats UP José Mayans LLA Ezequiel Atauche Por Santa Cruz José María Carambia PRO Luis Juez UCR Eduardo Vischi

Background

These midterm elections will be the first during the presidency of Javier Milei.^[3]

Electoral system

Number of Deputies at stake in each district.

Provinces that elect Senators in blue.

The 2025 elections will be the first in which the unified paper ballot (in Spanish: Boleta Única de Papel, BUP) system is used, following a 2024 reform of the electoral law.^[4] It will also be the first national election since 2011 without Open, Mandatory and Simultaneous Primaries (PASO); the PASO primary system was suspended ahead of the 2025 contest but is still legally in place.^[5]

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.^[6] In the 2025 election, 127 of the 257 seats are up for renewal for a four-year term.^[7]

Province	Seats	Seats at 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

Senate

The 72 members of the Senate are elected in the same 24 constituencies, 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.^[8] The 2025 elections will see one-third of senators renewed, with eight provinces electing three senators; Chaco, Entre Ríos, Neuquén, Río Negro, Salta, Santiago del Estero, Tierra del Fuego and the City of Buenos Aires.^[7]

Opinion polls

Polling chart

Opinion polling for the 2025 Argentine legislative election using Local regression (LOESS) of polls conducted. Kirchnerism and Federal Peronism entries merged into UXP. Data up to 11 April 2025.

2025

Polling firm	Fieldwork date	Sample size		Kirchnerism	Federal Peronism				Others	Undecided	Lead
Tendencias	18–23 April 2025	9490	36.1	33.7	2.1	9.2	2.4	5.7	–	10.8	2.4
Proyección	29 March – 4 April 2025	2397	29.3	31.7	–	6.4	3.7	2.9	1.9	24.2	2.4
Tendencias	29 March – 4 April 2025	8865	36.8	34.6	2.4	11.1		5.6	-	9.5	2.2
Analogías	28–31 March 2025	2864	30.8	30.2	-	10.8	5.3	4.3	-	18.6	0.6
Opina Argentina	1–4 March 2025	2085	38	32	4	7	4	4	3	7	6
Analogías	25–28 February 2025	2733	33.1	30.4	-	10.6	3.6	3	4.6	14.9	2.7
Tendencias	24–28 February 2025	11077	40.9	35.1	1.9	8.2		5.8	-	8.1	5.8
Poliarquía	February 2025	—	36	16	9	9	3	9	2	17	20
Isasi Burdman	February 2025	—	37	10	11	12	4	3	23		25
Proyección	17–22 February 2025	2029	28.8	17.9	15.4	5.8	3.3	2.2	2.7	23.9	10.9
Management & Fit	10–21 February 2025	2200	41.6	26.7	9.4	6.4	2.6	3.5	3.1	6.6	14.9
Pulso Research	1–7 February 2025	1777	31.4	18.4	5.4	6.3	3.3	4.5	9.4	21.2	13
Aresco	January 2025	—	47.2	36.1	—	7.9	6	—	2.8	—	11.1
Isasi Burdman	January 2025	—	36	9	12	10	4	3	4	21	24
Management & Fit	26 January 2025	—	42.1	26.5	9.8	7	1.8	2.8	3	7	15.6
Analogías	19–23 January 2025	2645	33.6	31.1	—	8.7	4.4	4.4	—	17.8	2.5
Pulso Research	6–12 January 2025	1900	30.2	15.9	7	5	3.6	4	8.2	26.1	14.3

2024

Polling firm	Fieldwork date	Sample size		Kirchnerism	Federal Peronism				Others	Undecided	Lead
D'Alessio Irol - Berensztein[9]	December 2024	1035	35	24	—	17	8	4	9	2	11
Isasi Burdman[10]	December 2024	2065	37	10	11	9	3	5	21		26
Fixer[11]	11–20 December 2024	1100	37	35	2	6	3	5	—	8	2
Synospsis[12]	5–13 December 2024	—	39.8	26.8	11	5.7	2.9	2.9	4	6.9	13
Pulso Research[13]	4–11 December 2024	1700	32.6	20.8	6	3.8	2.8	3.9	7.7	22.3	11.8
Aresco[14]	December 2024	—	45.4	34.3	—	7	4.1	—	9.1	—	11.1
CB Consultora[15]	2–6 December 2024	1562	39.4	18.5	9	6.6	1.8	5.4	3.8	15	20.9
Sentimetro[16]	3 December 2024	1100	46	14	6	7	2	6	3	16	32
Isasi-Burdman[17]	20 November 2024	2091	34	7	15	14	2	4	21		19
Opinión Lab[18]	12 November 2024	1800	34	24	11	7	3	3	7	10	10
Pulso Research[19]	4–11 November 2024	2091	32.3	15.7	6.3	5.7	1.8	2.9	10.2	25	16.6
Flxer	5 November 2024	1790	34	33	3	7	2	5	—	14	1
Poliarquía[20]	October 2024	—	34	18	8	9	6	6	2	17	16
Opina Argentina[21]	25 October 2024	1764	33	33	5	10	5	3	3	8	Tie
DC Consultores[22]	22 October 2024	—	54.2	8.4	25.3	5.6	3.7	2.8	—	—	28.9
Proyección Consultores[23]	16 October 2024	1822	27.2	20.5	14	8	5.7	3	—	21.6	6.7
Isasi/Burdman[24]	12–17 October 2024	2057	28	9	16	13	4	4	3	23	12
Pulso Research[25]	2–9 October 2024	2000	30	20.7	6.3	6.3	2.9	4.8	9.2	19.7	9.3
Poliarquía[26]	September 2024	—	35	16	12	10	4	4	1	19	19
Pulso Research[27]	2–9 September 2024	2112	29.5	20.4	8.2	7.4	4.7	5.1	7.7	17	9.1
Poliarquía[28]	August 2024	—	39	13	5	13	2	5	1	21	26
Lucas Romero[29]	8–14 August 2024	1186	30.9	15.8	22.2	9.4	3.6	4.7	2.2	11.2	8.7
Pulso Research[30]	2–8 August 2024	2800	29.3	18.9	9.2	8.1	4.1	5.1	6.6	18.7	10.4
Poliarquía[31]	July 2024	—	36	15	8	14	3	5	2	18	21
Pulso Research[32]	1–10 July 2024	2350	31.7	16.5	11.2	6.1	3.8	6.3	8.2	16.3	15.2
Pulso Research[33]	1–10 June 2024	2661	33.5	18.6	8	5	4.7	5.3	5.4	19.5	14.9
Opinión Lab[34]	3 June 2024	1538	37	17	13	7	3	4	8	12	20
Pulso Research[35]	1–10 May 2024	2113	34.8	17	8.5	6.8	4.4	5.7	—	22.8	17.8
Pulso Research[36]	4–15 April 2024	2014	31.7	15.1	12.1	5	5.3	6	—	24.8	16.6
Pulso Research[37]	4–14 March 2024	1914	34.2	19.7	8.7	5.5	4.2	3.9	—	23.7	14.5