| Election Name: | 2020 Guamanian legislative election |
| Country: | Guam |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 2018 Guamanian legislative election |
| Previous Year: | 2018 |
| Next Election: | 2022 Guamanian legislative election |
| Next Year: | 2022 |
| Seats For Election: | All 15 seats of the Legislature of Guam |
| Election Date: | November 3, 2020 |
| Image1: | Speaker Tina Muna Barnes signing an Executive Order in her capacity as Acting Lt. Governor of Guam..jpg |
| Leader1: | Tina Rose Muna Barnes |
| Party1: | Democratic Party (Guam) |
| Leaders Seat1: | At-large district |
| Seats Before1: | 10 |
| Seats1: | 8 |
| Seat Change1: | 2 |
| Leader2: | Telo T. Taitague |
| Party2: | Republican Party (Guam) |
| Leaders Seat2: | At-large district |
| Seats Before2: | 5 |
| Seats2: | 7 |
| Seat Change2: | 2 |
| Speaker | |
| Before Election: | Tina Rose Muña Barnes |
| Before Party: | Democratic |
| After Election: | Therese M. Terlaje |
| After Party: | Democratic |
Legislative elections were held in Guam on Tuesday, November 3, 2020,[1] along with the election for the Guam delegate to the U.S. House of Representatives. Before the election, the Democratic Party held ten of the fifteen seats in the Legislature while the Republican Party held five seats. The election resulted in a gain of two seats for the Republican and a loss of two seats for Democrats to retain. Democrats also won the runoff race for Guam's US House Delegate.
Because of the COVID-19 pandemic, Guam cancelled its August primary elections. All 29 certified candidates advanced to the Legislative general election and appeared on the ballot in November 2020.
The members of the legislature are elected at-large with the first 15 winning candidates elected as the new members of the legislature. The Republican Party picked up two seats from Democrats, leaving the composition for the next legislature at 8 Democrats and 7 Republicans. Democrat Michael F.Q. San Nicolas also won the re-election for the runoff Delegate.
There were 15 senators elected on November 3, 2020, to serve in the 36th Guam Legislature and set to inaugurated on January 4, 2021: