| Election Name: | 1921 Prussian state election |
| Country: | Free State of Prussia |
| Previous Election: | 1919 |
| Next Election: | 1924 |
| Election Date: | 20 February 1921 |
| Seats For Election: | 406 of the 428 seats in the Landtag of Prussia |
| Majority Seats: | 215 |
| Turnout: | 77.4% (2.6pp) |
| Ongoing: | no |
| First Election: | no |
| Noleader: | yes |
| Party1: | Social Democratic Party |
| Percentage1: | 26.3% |
| Seats1: | 114 |
| Last Election1: | 145 |
| Party2: | German National People's Party |
| Percentage2: | 18.1% |
| Seats2: | 75 |
| Last Election2: | 48 |
| Party3: | Centre Party |
| Percentage3: | 17.2% |
| Seats3: | 81 |
| Last Election3: | 93 |
| Party4: | German People's Party |
| Percentage4: | 14.2% |
| Seats4: | 58 |
| Last Election4: | 23 |
| Party5: | Communist Party of Germany |
| Percentage5: | 7.4% |
| Seats5: | 31 |
| Last Election5: | New |
| Party6: | Independent Social Democratic Party |
| Percentage6: | 6.6% |
| Seats6: | 28 |
| Last Election6: | 24 |
| Party7: | German Democratic Party |
| Percentage7: | 6.2% |
| Seats7: | 26 |
| Last Election7: | 65 |
| Party8: | German-Hanoverian Party |
| Percentage8: | 2.7% |
| Seats8: | 11 |
| Last Election8: | 2 |
| Party9: | Economic Party |
| Percentage9: | 1.2% |
| Seats9: | 4 |
| Last Election9: | New |
| Government | |
| Before Election: | First Braun cabinet |
| Before Party: | SPD–Z–DDP |
| After Election: | Stegerwald cabinet |
| After Party: | Z–DDP |
State elections were held in the Free State of Prussia on 20 February 1921 to elect 406 of the 428 members of the Landtag of Prussia.[1] The governing coalition of the Social Democratic Party, Centre Party, and German Democratic Party suffered major losses, losing one-third of its collective voteshare from 1919, but retained a narrow majority. The right-liberal German People's Party (DVP) and reactionary nationalist German National People's Party (DNVP) made the largest gains, with the DNVP becoming the second largest party by voteshare. The Communist Party of Germany contested its first Prussian election, winning 31 seats.
No election was held on the constituency of Oppeln due to the Upper Silesia plebiscite, which was held one month after the state elections. The delegation of 22 deputies which had been elected in Oppeln in 1919 continued in office until a 1922 by-election.[2] The discrepancy between these results meant that the Centre Party held more seats in the Landtag than the DNVP after the 1921 election, despite winning fewer votes.
| Party | Votes | % | Swing | Seats | +/– | ||
|---|---|---|---|---|---|---|---|
| bgcolor= | Social Democratic Party (SPD) | 4,295,305 | 26.26 | –10.12 | 114 | –31 | |
| bgcolor= | German National People's Party (DNVP) | 2,957,784 | 18.08 | +6.86 | 75 | +27 | |
| bgcolor= | Centre Party (Zentrum) | 2,819,989 | 17.24 | –4.98 | 81 | –12 | |
| bgcolor= | German People's Party (DVP) | 2,319,281 | 14.18 | +8.49 | 58 | +35 | |
| bgcolor= | United Communist Party of Germany (VKPD) | 1,211,749 | 7.41 | New | 31 | New | |
| bgcolor= | Independent Social Democratic Party (USPD) | 1,076,498 | 6.58 | –0.84 | 28 | +4 | |
| bgcolor= | German Democratic Party (DDP) | 1,013,239 | 6.19 | –10.01 | 26 | –39 | |
| bgcolor= | German-Hanoverian Party and Schleswig-Holstein State Party (SHLP) | 438,548 | 2.68 | +2.19 | 11 | +8 | |
| Economic Party of the German Middle Classes (WP) | 192,780 | 1.18 | New | 4 | New | ||
| Christian People's Party (CVP) | 14,140 | 0.09 | New | 0 | New | ||
| Polish Party | 12,081 | 0.07 | New | 0 | New | ||
| Schleswiger Association | 4,720 | 0.03 | New | 0 | New | ||
| Christian Social People's Party | 982 | 0.01 | New | 0 | New | ||
| Factionless Party | 934 | 0.01 | New | 0 | New | ||
| Non-partisan | 54 | 0.00 | New | 0 | New | ||
| Invalid/blank votes | 212,987 | 1.29 | – | – | – | ||
| Total | 16,357,755 | 100 | – | 428 | +27 | ||
| Registered voters/turnout | 21,410,148 | 77.40 | +2.61 | – | – | ||
| align=left colspan=7 | Gonschior.de | ||||||
| Constituency | SPD | DNVP | Z | DVP | VKPD | USPD | DDP | DHP | WP | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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| 1. East Prussia | 24.0 | 31.0 | 9.6 | 14.7 | 7.0 | 5.7 | 5.7 | – | 1.0 | ||||||||
| 2. Berlin | 22.7 | 17.4 | 3.9 | 12.5 | 11.6 | 20.3 | 6.8 | – | 4.8 | ||||||||
| 3. Potsdam II | 21.6 | 20.4 | 3.0 | 19.8 | 7.2 | 13.3 | 9.6 | – | 5.1 | ||||||||
| 4. Potsdam I | 27.3 | 23.8 | 2.0 | 16.3 | 8.3 | 12.4 | 6.3 | – | 3.6 | ||||||||
| 5. Frankfurt an der Oder | 31.9 | 32.3 | 6.1 | 13.0 | 2.8 | 6.2 | 6.5 | – | 1.3 | ||||||||
| 6. Pomerania | 29.4 | 42.5 | 0.7 | 14.1 | 3.3 | 4.7 | 3.3 | – | 2.1 | ||||||||
| 7. Breslau | 39.9 | 21.5 | 19.6 | 8.4 | 2.5 | 0.9 | 5.6 | – | 1.6 | ||||||||
| 8. Liegnitz | 39.7 | 22.8 | 8.8 | 11.8 | 2.6 | 1.9 | 9.4 | – | 3.0 | ||||||||
| 9. Oppeln | |||||||||||||||||
| 10. Magdeburg | 41.3 | 18.1 | 1.8 | 15.5 | 3.9 | 7.6 | 11.4 | – | 0.4 | ||||||||
| 11. Merseburg | 10.6 | 22.9 | 1.2 | 14.4 | 29.8 | 11.3 | 9.9 | – | – | ||||||||
| 12. Erfurt | 11.0 | 11.6 | 14.3 | 14.3 | 11.1 | 17.8 | 6.9 | – | – | ||||||||
| 13. Schleswig-Holstein | 37.1 | 20.9 | 0.8 | 18.2 | 6.0 | 3.2 | 8.8 | – | – | ||||||||
| 14. Weser-Ems | 19.1 | 8.5 | 17.8 | 2.4 | 5.3 | 9.2 | 37.6 | – | |||||||||
| 15. Hanover East | 32.5 | 9.6 | 14.4 | 3.8 | 4.1 | 4.6 | 31.1 | – | |||||||||
| 16. Hanover South | 40.8 | 7.7 | 18.7 | 3.5 | 2.1 | 4.6 | 22.7 | – | |||||||||
| 17. Westphalia North | 22.2 | 10.2 | 45.5 | 10.6 | 5.5 | 2.6 | 3.4 | – | – | ||||||||
| 18. Westphalia South | 25.0 | 8.1 | 29.4 | 15.6 | 9.5 | 7.3 | 5.1 | – | – | ||||||||
| 19. Hesse-Nassau | 31.7 | 15.9 | 17.8 | 16.6 | 4.2 | 4.2 | 8.7 | – | 0.8 | ||||||||
| 20. Köln-Aachen | 19.4 | 5.8 | 55.6 | 9.2 | 5.4 | 1.0 | 3.6 | – | – | ||||||||
| 21. Koblenz-Trier | 11.5 | 5.5 | 63.7 | 11.2 | 2.3 | 0.5 | 2.8 | – | – | ||||||||
| 22. Düsseldorf East | 14.5 | 14.1 | 26.9 | 14.1 | 16.6 | 9.2 | 4.7 | – | – | ||||||||
| 23. Düsseldorf West | 14.3 | 8.0 | 47.1 | 13.5 | 10.0 | 3.8 | 3.2 | – | – | ||||||||
| Party | Votes | % | Seats | +/– | ||
|---|---|---|---|---|---|---|
| bgcolor= | Centre Party (Zentrum) | 207,503 | 38.11 | 76 | –5 | |
| bgcolor= | Social Democratic Party (SPD) | 80,861 | 14.85 | 109 | –5 | |
| bgcolor= | German National People's Party (DNVP) | 79,312 | 14.57 | 76 | +1 | |
| Polish Party | 51,638 | 9.48 | 2 | +2 | ||
| bgcolor= | German People's Party (DVP) | 42,329 | 7.77 | 59 | +1 | |
| bgcolor= | United Communist Party of Germany (VKPD) | 41,597 | 7.64 | 31 | 0 | |
| German Social Party (DSP) | 22,981 | 4.22 | 0 | New | ||
| bgcolor= | German Democratic Party (DDP) | 15,152 | 2.78 | 26 | 0 | |
| bgcolor= | Independent Social Democratic Party (USPD) | 1,188 | 0.22 | 27 | –1 | |
| Economic Party (WP) | 915 | 0.17 | 4 | 0 | ||
| bgcolor= | German-Hanoverian Party and Schleswig-Holstein State Party (SHLP) | 532 | 0.10 | 11 | 0 | |
| Upper Silesian Catholic People's Party | 246 | 0.05 | 0 | New | ||
| Schleswiger Association | 134 | 0.02 | 0 | 0 | ||
| Christian People's Party (CVP) | 36 | 0.01 | 0 | 0 | ||
| Christian Social People's Party | 30 | 0.01 | 0 | 0 | ||
| Factionless Party | 1 | 0.00 | 0 | 0 | ||
| Invalid/blank votes | 19,268 | 0.16 | – | – | ||
| Total | 544,455 | 100 | 421 | –7 | ||
| Registered voters/turnout | 834,805 | 65.22 | – | – | ||
| align=left colspan=6 | Gonschior.de | |||||