The 1931 Hamburg state election was held on 27 September 1931 to elect the 160 members of the Hamburg Parliament.[1]
| Party | Votes | % | Seats | +/– |
| Social Democratic Party of Germany | 214,553 | 27.8 | 46 | –14 |
| Nazi Party | 202,506 | 26.3 | 43 | +40 |
| Communist Party of Germany | 168,674 | 21.9 | 35 | +8 |
| German State Party | 67,105 | 8.7 | 14 | New |
| German National People's Party | 43,278 | 5.6 | 9 | –13 |
| German People's Party | 36,927 | 4.8 | 7 | –13 |
| Reich Party of the German Middle Class | 11,375 | 1.5 | 2 | New |
| Christian Social People's Service | 10,858 | 1.4 | 2 | New |
| Centre Party | 10,798 | 1.4 | 2 | 0 |
| Antikapitalistische Einheitsfront | 1,956 | 0.3 | 0 | New |
| Reich Party for Civil Rights and Deflation | 1,156 | 0.2 | 0 | –1 |
| Freiwirtschaftliche Partei Deutschlands | 987 | 0.1 | 0 | New |
| Notgemeinschaft bedrohter Existenzen | 510 | 0.1 | 0 | New |
| Independent Social Democratic Party of Germany | 484 | 0.1 | 0 | 0 |
| Communist Party of Germany (Opposition) | 315 | 0.0 | 0 | New |
| Invalid/blank votes | 9,252 | – | – | – |
| Total | 780,734 | 100 | 160 | 0 |
| Registered voters/turnout | 932,180 | 83.8 | – | – |
| Source: Elections in the Weimar Republic[1] |
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