| Election Name: | 2018 Guamanian legislative election |
| Country: | Guam |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 2016 Guamanian legislative election |
| Previous Year: | 2016 |
| Next Election: | 2020 Guamanian legislative election |
| Next Year: | 2020 |
| Turnout: | ~66% |
| Seats For Election: | All 15 seats of the Legislature of Guam |
| Election Date: | November 6, 2018 |
| Image1: | 3x4.svg |
| Leader1: | Benjamin Cruz (retired) |
| Party1: | Democratic Party (United States) |
| Leaders Seat1: | At-large district |
| Seats Before1: | 9 |
| Seats1: | 10 |
| Seat Change1: | 1 |
| Leader2: | James Espaldon (retired) |
| Party2: | Republican Party (United States) |
| Leaders Seat2: | At-large district |
| Seats Before2: | 6 |
| Seats2: | 5 |
| Seat Change2: | 1 |
| Speaker | |
| Before Election: | Benjamin J.F. Cruz |
| Before Party: | Democratic |
| After Election: | Tina Muña Barnes |
| After Party: | Democratic Party of Guam |
Legislative elections were held in Guam on Tuesday, November 6, 2018,[1] along with the election for the Guam delegate to the U.S. House of Representatives. Before the election, the Democratic Party held nine of the fifteen seats in the Legislature while the Republican Party held six seats.The election resulted in a gain of one seat for the Democrats and a loss of one seat for Republicans. Democrats also won the race for Guam's US House Delegate.
Primary elections in Guam were held on August 25, 2018. The first 15 candidates who win the highest votes for each party will move on to the general election.
Five Democrats hopefuls were eliminated in the 2018 primaries:
Four Republican hopefuls were eliminated in the 2018 primaries:
The members of the legislature are elected at-large with the first 15 winning candidates elected as the new members of the legislature. The Democratic Party picked up one seat from Republicans, leaving the composition for the next legislature at 10 Democrats and 5 Republicans.[2] Democrat Michael F.Q. San Nicolas also won the race for Delegate.
There were 15 senators elected on November 6, 2018 to serve in the 35th Guam Legislature and were inaugurated on January 7, 2019: