| Country: | Argentina |
| Previous Election: | 1938 |
| Next Election: | 1942 |
| Election Date: | 3 March 1940 |
| Election Name: | 1940 Argentine legislative election |
| Seats For Election: | 82 of 158 seats in the National Congress |
| Ongoing: | no |
| Turnout: | 70.31% |
| Noleader: | yes |
| Party1: | Radical Civic Union |
| Colour1: |
|
| Percentage1: | 47.62% |
| Seats1: | 52 |
| Last Election1: | 27 |
| Party2: | Concordance |
| Colour2: |
|
| Percentage2: | 39.41% |
| Seats2: | 25 |
| Last Election2: | 52 |
| Party3: | Socialist Party |
| Colour3: |
|
| Percentage3: | 8.43% |
| Seats3: | 5 |
| Last Election3: | 0 |
| Map: | Elecciones legislativas de Argentina de 1940 - Resultados por distrito.svg |
| Map Upright: | 2 |
Legislative elections were held in Argentina on 3 March 1940. Voter turnout was 70%.
| Party | Votes | % | Seats won | Total seats | ||
|---|---|---|---|---|---|---|
| Radical Civic Union (UCR) | 876,991 | 47.62 | 52 | 78 | ||
| bgcolor=#bfd0da rowspan=9 | Total Concordance | 725,757 | 39.41 | 25 | 74 | |
| National Democratic Party (PDN) | 453,869 | 24.65 | 17 | 49 | ||
| Santa Fe Radical Civic Union (UCR-SF) | 122,007 | 6.63 | 3 | 8 | ||
| Concordance - National Front | 68,948 | 3.74 | — | — | ||
| Civic Concentration (CC) | 38,151 | 2.07 | 2 | 6 | ||
| Antipersonalist Radical Civic Union (UCR-A) | 32,740 | 1.78 | 3 | 11 | ||
| Independent Socialist Party (PSI) | 4,210 | 0.23 | — | — | ||
| Unified Radical Civic Union | 3,769 | 0.20 | — | — | ||
| Buenos Aires Province Radical Civic Union | 2,063 | 0.11 | — | — | ||
| Socialist Party (PS) | 155,152 | 8.43 | 5 | 5 | ||
| Labour Gathering Party (CO) | 30,312 | 1.65 | — | — | ||
| Tucumán Radical Civic Union (UCR) | 23,888 | 1.30 | — | 1 | ||
| Mendoza Radical Party | 8,810 | 0.48 | — | — | ||
| bgcolor=lightgrey | Servants of the State Defenders | 5,884 | 0.32 | — | — | |
| Buenos Aires City Radical Party | 5,278 | 0.29 | — | — | ||
| Socialist Workers' Party (PSO) | 4,647 | 0.25 | — | — | ||
| bgcolor=lightblue | Buenos Aires City Conservative Party | 3,253 | 0.18 | — | — | |
| Agrarian Party | 1,471 | 0.08 | — | — | ||
| Others | 30 | 0.00 | — | — | ||
| Total | 1,841,473 | 100 | 82 | 158 | ||
| bgcolor=#333333 colspan=4 | ||||||
| Positive votes | 1,841,473 | 96.22 | ||||
| Blank votes | 63,180 | 3.30 | ||||
| Invalidvotes | 314 | 0.02 | ||||
| Tally sheet differences | 8,814 | 0.46 | ||||
| Total votes | 1,913,781 | 100 | ||||
| Registered voters/turnout | 2,721,806 | 70.31 | ||||
| Source:[1] | ||||||
| Province | UCR | Concordance | PS | Others | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Votes | % | Seats | Votes | % | Seats | Votes | % | Seats | Votes | % | Seats | |||||
| scope=row | Buenos Aires | bgcolor=pink | 272,592 | bgcolor=pink | 54.62 | align=center bgcolor=pink | 15 | 211,250 | 42.33 | 7 | 15,248 | 3.06 | — | 18 | 0.00 | — |
| scope=row | Buenos Aires City | bgcolor=pink | 164,362 | bgcolor=pink | 40.56 | align=center bgcolor=pink | 12 | 76,927 | 18.98 | — | 119,186 | 29.41 | 5 | 44,727 | 11.04 | — |
| scope=row | Córdoba | bgcolor=pink | 117,422 | bgcolor=pink | 54.83 | align=center bgcolor=pink | 6 | 92,583 | 43.23 | 3 | 4,159 | 1.94 | — | — | — | — |
| scope=row | Corrientes | — | — | — | bgcolor=lightblue | 64,689 | bgcolor=lightblue | 99.98 | align=center bgcolor=lightblue | 4 | — | — | — | 12 | 0.02 | — |
| scope=row | Entre Ríos | bgcolor=pink | 77,324 | bgcolor=pink | 57.89 | align=center bgcolor=pink | 4 | 53,510 | 40.06 | 2 | 2,746 | 2.06 | — | — | — | — |
| scope=row | Mendoza | 27,059 | 39.69 | align=center bgcolor=pink | 2 | bgcolor=lightblue | 27,098 | bgcolor=lightblue | 39.75 | 1 | 558 | 0.82 | — | 13,457 | 19.74 | — |
| scope=row | San Luis | 9,534 | 38.97 | 1 | bgcolor=lightblue | 14,934 | bgcolor=lightblue | 61.03 | align=center bgcolor=lightblue | 2 | — | — | — | — | — | — |
| scope=row | Santa Fe | bgcolor=pink | 139,214 | bgcolor=pink | 51.47 | align=center bgcolor=pink | 8 | 122,007 | 45.11 | 3 | 9,268 | 3.43 | — | — | — | — |
| scope=row | Santiago del Estero | 29,551 | 42.89 | 1 | bgcolor=lightblue | 38,151 | bgcolor=lightblue | 55.37 | align=center bgcolor=lightblue | 2 | 1,195 | 1.73 | — | — | — | — |
| scope=row | Tucumán | bgcolor=pink | 39,933 | bgcolor=pink | 43.08 | align=center bgcolor=pink | 3 | 24,608 | 26.55 | 1 | 2,792 | 3.01 | — | 25,359 | 27.36 | — |
| Total | 876,991 | 47.62 | 52 | 725,757 | 39.41 | 25 | 155,152 | 8.43 | 5 | 83,573 | 4.54 | 0 | ||||