| Election Name: | 1920 Queensland state election |
| Country: | Queensland |
| Type: | parliamentary |
| Ongoing: | no |
| Previous Election: | 1918 Queensland state election |
| Previous Year: | 1918 |
| Next Election: | 1923 Queensland state election |
| Next Year: | 1923 |
| Seats For Election: | All 72 seats in the Legislative Assembly of Queensland 37 Assembly seats were needed for a majority |
| Turnout: | 79.93 (0.34 pp) |
| Leader1: | Ted Theodore |
| Party1: | Australian Labor Party (Queensland Branch) |
| Leaders Seat1: | Chillagoe |
| Popular Vote1: | 168,455 |
| Percentage1: | 47.77% |
| Swing1: | 5.91 |
| Last Election1: | 48 seats, 53.68% |
| Seats Before1: | 47 |
| Seats1: | 38 |
| Seat Change1: | 9 |
| Leader2: | William Vowles |
| Leader Since2: | 28 January 1920 |
| Party2: | Country |
| Leaders Seat2: | Dalby |
| Popular Vote2: | 60,170 |
| Percentage2: | 17.06% |
| Swing2: | 17.06 |
| Last Election2: | Did not contest |
| Seats Before2: | 11 |
| Seats2: | 18 |
| Seat Change2: | 7 |
| Leader4: | Walter Barnes |
| Leader Since4: | 28 July 1920 |
| Party4: | National Party (Queensland, 1917) |
| Leaders Seat4: | Bulimba |
| Popular Vote4: | 90,730 |
| Percentage4: | 25.73% |
| Swing4: | 18.89 |
| Last Election4: | 22 seats, 44.62% |
| Seats Before4: | 11 |
| Seats4: | 13 |
| Seat Change4: | 2 |
| Leader5: | Edward Swayne |
| Leader Since5: | — |
| Party5: | Northern Country Party |
| Leaders Seat5: | Mirani |
| Popular Vote5: | 20,246 |
| Percentage5: | 5.74% |
| Swing5: | New party |
| Last Election5: | Did not exist |
| Seats Before5: | 1 |
| Seats5: | 3 |
| Seat Change5: | 2 |
| Premier | |
| Before Election: | Ted Theodore |
| Before Party: | Australian Labor Party (Queensland Branch) |
| After Election: | Ted Theodore |
| After Party: | Australian Labor Party (Queensland Branch) |
Elections were held in the Australian state of Queensland on 9 October 1920 to elect the 72 members of the state's Legislative Assembly. The Labor government was seeking its third term in office since the 1915 election. It was Premier Ted Theodore's first election.
During the previous term, the Queensland Country Party, had re-emerged from the National bloc, taking half of the Country Party's parliamentary seats with it. A Labor member, Alfred James, switched to the party, and the Maranoa by-election in 1919 saw them gain a seat at the expense of Labor. An additional party, the Northern Country Party, also formed during this time to represent the interests of North Queensland farmers and canegrowers. To avoid three-cornered contests with Labor, the three parties agreed upon a division of seats between themselves.
| Date | Event | |
|---|---|---|
| 10 September 1920 | The Parliament was dissolved. | |
| 10 September 1920 | Writs were issued by the Governor to proceed with an election. | |
| 18 September 1920 | Close of nominations. | |
| 9 October 1920 | Polling day, between the hours of 8am and 6pm. | |
| 12 November 1920 | The Theodore Ministry was reconstituted. | |
| 15 November 1920 | The writ was returned and the results formally declared. |
See also: Results of the Queensland state election, 1920.
|}
462,218 electors were enrolled to vote at the election, but 2 Country Party seats (Cooroora and Cunningham), 1 United Party seat (Albert) and 1 Labor seat (Mitchell) were unopposed.
This table lists changes in party representation at the 1920 election.
The following seats changed party representation before the election due to the split of the National party.
| Seat | Incumbent member | Former party | New party | ||||
|---|---|---|---|---|---|---|---|
| Albert | John Appel | National Party | Country Party | ||||
| Aubigny | Arthur Moore | National Party | Country Party | ||||
| Burnett | Bernard Corser | National Party | Country Party | ||||
| Cooroora | Harry Walker | National Party | Country Party | ||||
| Dalby | William Vowles | National Party | Country Party | ||||
| Drayton | William Bebbington | National Party | Country Party | ||||
| Fassifern | Ernest Bell | National Party | Country Party | ||||
| Logan | Alfred James | Labor Party | Country Party | ||||
| Mirani | Edward Swayne | National Party | Northern Country | ||||
| Murilla | Godfrey Morgan | National Party | Country Party | ||||
| Murrumba | Richard Warren | National Party | Country Party | ||||
| Nanango | Robert Hodge | National Party | Country Party | ||||
| Seat | Incumbent member | Party | New member | Party | ||||
|---|---|---|---|---|---|---|---|---|
| Burrum | Albert Whitford | Labor | William Brand | Country | ||||
| Carnarvon | Donald Gunn | National | Edward Costello | Country | ||||
| Cunningham | Francis Grayson | Independent | William Deacon | Country | ||||
| Enoggera | William Lloyd | Labor | Jim Kerr | National | ||||
| Kennedy | James O'Sullivan | Labor | John Jones | Northern Country | ||||
| Logan | Alfred James | Country | Reginald King | National | ||||
| Maranoa | Thomas Spencer | Country | Charles Conroy | Labor | ||||
| Merthyr | Peter McLachlan | Labor | Peter MacGregor | National | ||||
| Musgrave | Thomas Armfield | Labor | Henry Cattermull | Country | ||||
| Nanango | Robert Hodge | Country | Jim Edwards | Independent Country | ||||
| Pittsworth | Percy Bayley | Independent | Cecil Roberts | Country | ||||
| Port Curtis | George Carter | Labor | John Fletcher | National | ||||
| Stanley | Henry Somerset | National | Frederick Nott | Country | ||||
| Townsville | Daniel Ryan | Labor | William Green | Northern Country | ||||
| Wide Bay | Andrew Thompson | Labor | Harry Clayton | Country | ||||