| Country: | Latvia |
| Election Date: | 3–4 October 1931 |
| Previous Election: | 1928 |
| Next Election: | 1940 |
| Party1: | Latvian Social Democratic Workers' Party |
| Percentage1: | 19.23 |
| Seats1: | 21 |
| Last Election1: | 25 |
| Party2: | Latvian Farmers' Union |
| Percentage2: | 12.25 |
| Seats2: | 14 |
| Last Election2: | 16 |
| Percentage3: | 8.16 |
| Seats3: | 8 |
| Last Election3: | 6 |
| Percentage4: | 6.33 |
| Seats4: | 6 |
| Last Election4: | 5 |
| Party5: | Democratic Centre (Latvia) |
| Percentage5: | 6.24 |
| Seats5: | 6 |
| Last Election5: | 3 |
| Percentage6: | 5.79 |
| Seats6: | 7 |
| Last Election6: | 4 |
| Percentage7: | 5.04 |
| Seats7: | 5 |
| Last Election7: | 3 |
| Percentage8: | 4.01 |
| Seats8: | 5 |
| Last Election8: | 6 |
| Percentage9: | 2.27 |
| Seats9: | 3 |
| Last Election9: | New |
| Percentage10: | 2.19 |
| Seats10: | 3 |
| Last Election10: | 4 |
| Percentage11: | 2.12 |
| Seats11: | 2 |
| Last Election11: | 1 |
| Percentage12: | 2.12 |
| Seats12: | 2 |
| Last Election12: | New |
| Percentage13: | 1.96 |
| Seats13: | 2 |
| Last Election13: | New |
| Party14: | Agudas Israel (Latvia) |
| Percentage14: | 1.84 |
| Seats14: | 2 |
| Last Election14: | 1 |
| Percentage15: | 1.75 |
| Seats15: | 2 |
| Last Election15: | New |
| Percentage16: | 1.57 |
| Seats16: | 1 |
| Last Election16: | 1 |
| Party17: | Party of the Orthodox |
| Percentage17: | 1.25 |
| Seats17: | 1 |
| Last Election17: | 2 |
| Percentage18: | 1.22 |
| Seats18: | 1 |
| Last Election18: | 2 |
| Percentage19: | 1.09 |
| Seats19: | 1 |
| Last Election19: | 2 |
| Party20: | Orthodox Voters |
| Percentage20: | 1.05 |
| Seats20: | 1 |
| Last Election20: | New |
| Percentage21: | 0.92 |
| Seats21: | 1 |
| Last Election21: | 1 |
| Percentage22: | 0.87 |
| Seats22: | 1 |
| Last Election22: | New |
| Percentage23: | 0.86 |
| Seats23: | 1 |
| Last Election23: | New |
| Percentage24: | 0.63 |
| Seats24: | 1 |
| Last Election24: | New |
| Percentage25: | 0.62 |
| Seats25: | 1 |
| Last Election25: | New |
| Percentage26: | 0.61 |
| Seats26: | 1 |
| Last Election26: | 1 |
| Percentage27: | 0.50 |
| Seats27: | 1 |
| Last Election27: | 1 |
| Prime Minister | |
| Before Election: | Kārlis Ulmanis |
| Before Party: | Latvian Farmers' Union |
| After Election: | Marģers Skujenieks |
| After Party: | PA |
Parliamentary elections were held in Latvia on 3 and 4 October 1931.[1] The Latvian Social Democratic Workers' Party remained the largest party, winning 21 of the 100 seats.[2] They were the last elections held under the Constitution of Latvia before the 1934 coup d'état and the last competitive elections held under Latvian law until 1993.
For the elections the country was divided into five constituencies, electing a total of 100 MPs using proportional representation.[3] The list system used was made flexible, as voters were able to cross out candidates' names and replace them with names from other lists,[3] a system 35% of voters took advantage of.[3] Although 103 lists registered for the election, the number of competing lists dropped from 66 to 46.[4]