| Election Name: | 1921 Hamburg state election |
| Percentage1: | 40.6% |
| Image1: | File:Otto Stolten..jpg |
| Percentage2: | 14.1% |
| Seats2: | 23 |
| Turnout: | 70.9% 9.65pp |
| Party2: | DDP |
| Colour2: | FFCC00 |
| Seats1: | 67 |
| Type: | parliamentary |
| Party1: | SPD |
| Colour1: | E2001A |
| Seats For Election: | All 160 in the Bürgerschaft |
| Next Election: | 1924 Hamburg state election |
| Country: | Hamburg |
| Ongoing: | no |
| Leader1: | Otto Stolten |
| Party3: | DVP |
| Colour3: | 000000 |
| Leader3: | Franz Heinrich Witthoefft |
| Leader2: | Carl Wilhelm Petersen |
| Party4: | DNVP |
| Leader4: | Karl Anton Gutknecht |
| Colour4: | 63B8FF |
| Party5: | KPD |
| Percentage4: | 11.3% |
| Percentage3: | 13.9% |
| Seats4: | 18 |
| Seats3: | 23 |
| Colour6: | D3D3D3 |
| Party6: | Hamburgischer Wirtschaftsbund |
| Percentage6: | 3.5% |
| Seats6: | 5 |
| Leader6: | Johannes Hirsch |
| Party Name: | no |
| Next Year: | 1924 |
| Previous Election: | 1919 Hamburg state election |
| Previous Year: | 1919 |
| Image4: | File:GutknechtKarlAnton.jpg |
| Image6: | File:Johannes Hirsch (cropped).jpg |
| Image3: | File:Franz Heinrich Witthoeft.jpg |
| Seat Change1: | 15 |
| Seat Change2: | 10 |
| Swing2: | 6.4% |
| Seat Change3: | 10 |
| Popular Vote3: | 74,517 |
| Popular Vote1: | 217,774 |
| Popular Vote2: | 75,576 |
| Swing1: | 9.9% |
| Swing3: | 5.3% |
| Colour5: | 8B0000 |
| Image5: | File:Ernst_Thälmann_1932.jpg |
| Leader5: | Ernst Thälmann |
| Seats5: | 18 |
| Popular Vote5: | 59,179 |
| Percentage5: | 11.0% |
| Swing5: | 11.0% |
| Seat Change5: | 18 |
| Last Election5: | Did not run |
| Last Election6: | 7 seat, 4.2% |
| Last Election1: | 82 seats, 50.5% |
| Last Election2: | 33 seats, 20.5% |
| Last Election3: | 13 seats, 8.6% |
| Last Election4: | 4 seats, 2.9% |
| Popular Vote6: | 18,826 |
| Seat Change6: | 2 |
| Seat Change4: | 14 |
| Popular Vote4: | 60,446 |
| Party7: | Dr. Eddelbüttel |
| Leader7: | Dr. J.F.T. Eddelbüttel |
| Seats7: | 3 |
| Seat Change7: | 3 |
| Colour7: | D3D3D3 |
| Popular Vote7: | 12,049 |
| Percentage7: | 3.5% |
| Swing7: | 3.5% |
| Last Election7: | Did not exist |
| Swing4: | 8.4% |
| Swing6: | 0.7 |
| Leader8: | Paul Bergmann |
| Party8: | USPD |
| Colour8: | C40000 |
| Last Election8: | 13 seats, 2.5% |
| Seats8: | 2 |
| Seat Change8: | 11 |
| Popular Vote8: | 7,686 |
| Swing8: | 1.1% |
| Percentage8: | 1.4% |
| Party9: | Centre |
| Colour9: | 000000 |
| Leader9: | Bernhard Dinkgrefe |
| Image9: | File:Bernhard_Dinkgrefe.jpg |
| Last Election9: | Did not exist |
| Seats9: | 1 |
| Popular Vote9: | 6,575 |
| Percentage9: | 1.2% |
| Swing9: | 1.2% |
| Seat Change9: | 1 |
| Image8: | File:BergmannPaul.jpg |
| Image7: | Eddelbüttel |
The 1921 Hamburg state election was held on 20 February 1921 to elect the 160 members of the Hamburg Parliament.[1]
| Party | Votes | % | Seats | +/– | |
|---|---|---|---|---|---|
| Social Democratic Party of Germany | 217,774 | 40.6 | 67 | –15 | |
| German Democratic Party | 75,576 | 14.1 | 23 | –10 | |
| German People's Party | 74,517 | 13.9 | 23 | +10 | |
| German National People's Party | 60,446 | 11.3 | 18 | +14 | |
| Communist Party of Germany | 59,179 | 11.0 | 18 | New | |
| Hamburgischer Wirtschaftsbund | 18,826 | 3.5 | 5 | –2 | |
| Dr. Eddelbüttel | 12,049 | 2.3 | 3 | New | |
| Independent Social Democratic Party of Germany | 7,686 | 1.4 | 2 | –11 | |
| Centre Party | 6,575 | 1.2 | 1 | New | |
| Funke | 1,328 | 0.3 | 1 | New | |
| Albert Martens Hamburg | 1,106 | 0.2 | 0 | New | |
| Exekutivbeamte der Polizeibehörde Hamburg | 1,071 | 0.2 | 0 | New | |
| Invalid/blank votes | 2,166 | – | – | – | |
| Total | 538,299 | 100 | 160 | 0 | |
| Registered voters/turnout | 759,283 | 70.9 | – | ||
| Source: Elections in the Weimar Republic | |||||