| Country: | Kingdom of Denmark |
| Previous Election: | July 1920 |
| Next Election: | 1924 |
| Seats For Election: | All 149 seats in the Folketing |
| Majority Seats: | 75 |
| Election Date: | 21 September 1920 |
| Heading1: | Elected in Denmark |
| Leader1: | Niels Neergaard |
| Party1: | Venstre (Denmark) |
| Last Election1: | 51 |
| Seats1: | 51 |
| Percentage1: | 33.97 |
| Leader2: | Thorvald Stauning |
| Party2: | Social Democrats (Denmark) |
| Last Election2: | 42 |
| Seats2: | 48 |
| Percentage2: | 32.16 |
| Leader3: | Emil Piper |
| Party3: | Conservative People's Party (Denmark) |
| Last Election3: | 26 |
| Seats3: | 27 |
| Percentage3: | 17.89 |
| Leader4: | Carl Theodor Zahle |
| Party4: | Danish Social Liberal Party |
| Last Election4: | 16 |
| Seats4: | 18 |
| Percentage4: | 12.14 |
| Party5: | Industry Party |
| Last Election5: | 4 |
| Seats5: | 3 |
| Percentage5: | 2.26 |
| Party6: | Schleswig Party |
| Last Election6: | New |
| Seats6: | 1 |
| Percentage6: | 0.62 |
| Heading7: | Elected in the Faroe Islands |
| Leader7: | Oliver Effersøe |
| Party7: | Union Party (Faroe Islands) |
| Last Election7: | 1 |
| Seats7: | 1 |
| Percentage7: | 60.22 |
| Prime Minister | |
| Before Election: | Niels Neergaard |
| Before Party: | Venstre (Denmark) |
| After Election: | Niels Neergaard |
| After Party: | Venstre (Denmark) |
| Map: | Folketing1920sep.svg |
Folketing elections were held in Denmark on 21 September 1920,[1] except in the Faroe Islands, where they were held on 30 October. They were the first in which South Jutland County participated since the Schleswig Plebiscites and the return to Danish rule, and the total number of seats in the Folketing was increased from 140 to 149. The result was a victory for Venstre, which won 51 of the 149 seats. Voter turnout was 77.0% in Denmark proper and 56.2% in the Faroe Islands.[2]