1921 Hamburg state election

{{Infobox election

| election_name = 1921 Hamburg state election

| percentage1 = 40.6%

| image1 = File:Otto Stolten..jpg

| percentage2 = 14.1%

| seats2 = 23

| turnout = 70.9% {{decrease}} 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

| election_date = {{Start date|1921|02|20}}

| 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 = {{decrease}} 15

| seat_change2 = {{decrease}} 10

| swing2 = {{decrease}} 6.4%

| seat_change3 = {{increase}} 10

| popular_vote3 = 74,517

| popular_vote1 = 217,774

| popular_vote2 = 75,576

| swing1 = {{decrease}} 9.9%

| swing3 = {{increase}} 5.3%

| colour5 = 8B0000

| image5 = File:Ernst_Thälmann_1932.jpg

| leader5 = Ernst Thälmann

| seats5 = 18

| popular_vote5 = 59,179

| percentage5 = 11.0%

| swing5 = {{increase}} 11.0%

| seat_change5 = {{increase}} 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 = {{decrease}} 2

| seat_change4 = {{increase}} 14

| popular_vote4 = 60,446

| party7 = Dr. Eddelbüttel

| leader7 = Dr. J.F.T. Eddelbüttel

| seats7 = 3

| seat_change7 = {{increase}} 3

| colour7 = D3D3D3

| popular_vote7 = 12,049

| percentage7 = 3.5%

| swing7 = {{increase}} 3.5%

| last_election7 = Did not exist

| swing4 = {{increase}} 8.4%

| swing6 = {{decrease}} 0.7

| leader8 = Paul Bergmann

| party8 = USPD

| colour8 = C40000

| last_election8 = 13 seats, 2.5%

| seats8 = 2

| seat_change8 = {{decrease}} 11

| popular_vote8 = 7,686

| swing8 = {{decrease}} 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 = {{increase}} 1.2%

| seat_change9 = {{increase}} 1

| image8 = File:BergmannPaul.jpg

| image2 = File:PetersenCarlWilhelm.jpg

| image7 =

}}The 1921 Hamburg state election was held on 20 February 1921 to elect the 160 members of the Hamburg Parliament.{{Cite web|last=Gonschior|first=Andreas|title=Die Freie und Hansestadt Hamburg Bürgerschaftswahl 1921|url=http://www.gonschior.de/weimar/Hamburg/LT2.html|url-status=live|access-date=15 May 2021|website=Wahlen in der Weimarer Republik|archive-url=https://web.archive.org/web/20010308123714/http://www.gonschior.de:80/weimar/Hamburg/LT2.html |archive-date=2001-03-08 }}