Brunswick Landtag elections in the Weimar Republic
The Free State of Brunswick held elections to the Landtag between 1918 and 1933.
1918
| Party Abbreviation | % | seats |
| SPD | 27,68% | 17 |
| Brunswick State Electoral Association | 26,19% | 16 |
| USPD | 24,33% | 14 |
| DDP | 21,80% | 13 |
1920
| Party Abbreviation | % | seats |
| Brunswick State Electoral Association | 37,32% | 23 |
| USPD | 37,31% | 23 |
| SPD | 14,83% | 9 |
| DDP | 9,49% | 5 |
1922
| Party Abbreviation | % | seats |
| Brunswick State Electoral Association | 38,0% | 23 |
| USPD | 27,6% | 17 |
| SPD | 19,8% | 12 |
| DDP | 10,7% | 6 |
| KPD | 4,0% | 2 |
1924
| Party Abbreviation | % | seats |
| SPD | 37,4% | 19 |
| DNVP | 18,5% | 10 |
| DVP | 17,2% | 9 |
| Wirtschaftliche Einheitsliste | 8,3% | 4 |
| DDP | 5,3% | 2 |
| KPD | 4,5% | 2 |
| NSFB | 3,4% | 1 |
| Welfen | 3,2% | 1 |
1927
| Party Abbreviation | % | seats |
| SPD | 46,2% | 24 |
| DVP | 14,3% | 8 |
| DNVP | 9,4% | 5 |
| Wirtschaftsverband des Mittelstandes | 8,1% | 4 |
| KPD | 4,7% | 2 |
| DDP/Bauernbund | 4,6% | 2 |
| NSDAP | 3,7% | 1 |
1930
| Party Abbreviation | % | seats |
| SPD | 41,0% | 17 |
| Bürgerliche Einheitsliste | 26,0% | 11 |
| NSDAP | 22,9% | 9 |
| KPD | 6,8% | 2 |
| DStP | 3,0% | 1 |