| Election Name: | Washington State Senate elections, 2020 |
| Country: | Washington |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 2018 Washington State Senate election |
| Previous Year: | 2018 |
| Next Election: | 2022 Washington State Senate election |
| Next Year: | 2022 |
| Seats For Election: | 26 of 49 seats in the Washington State Senate |
| Majority Seats: | 25 |
| Election Date: | November 3, 2020 |
| Image1: | File:Randi Becker and Karen Keiser 2011 (cropped).jpg |
| Leader1: | Karen Keiser |
| Party1: | Washington Democratic Party |
| Leaders Seat1: | 33rd |
| Last Election1: | 28 |
| Seats1: | 28 |
| Popular Vote1: | 987,057 |
| Percentage1: | 49.59% |
| Swing1: | 14.96 pp |
| Leader2: | John Braun |
| Party2: | Washington Republican Party |
| Leaders Seat2: | 20th |
| Last Election2: | 21 |
| Seats2: | 21 |
| Popular Vote2: | 943,884 |
| Percentage2: | 47.42% |
| Swing2: | 13.50 pp |
| Map Size: | 350px |
| President pro tempore | |
| Before Party: | Democratic |
| After Election: | Karen Keiser |
| After Party: | Democratic |
The 2020 Washington State Senate elections took place as part of the biennial 2020 United States elections. Washington voters elected state senators in 26 of the 49 state legislative districts. Elections to the Washington State Senate were held on November 3, 2020.
Following the previous election in 2018, Democrats held a 28-seat majority in the Senate, compared to Republicans' 21 seats. Senators who did not run for re-election were Randi Becker,[1] Maureen Walsh,[2] and Hans Zeiger[3] (all Republicans).
Democrats retained control of the Washington State Senate following the 2020 general election, with the balance of power remaining unchanged: 28 (D) to 21 (R).[4]
| State Senate district | Incumbent | Party | Elected Senator | Party | ||
|---|---|---|---|---|---|---|
| 1st | Derek Stanford | Dem | Derek Stanford | Dem | ||
| 2nd | Randi Becker | Rep | Jim McCune | Rep | ||
| 3rd | Andy Billig | Dem | Andy Billig | Dem | ||
| 4th | Mike Padden | Rep | Mike Padden | Rep | ||
| 5th | Mark Mullet | Dem | Mark Mullet | Dem | ||
| 9th | Mark Schoesler | Rep | Mark Schoesler | Rep | ||
| 10th | Ron Muzzall | Rep | Ron Muzzall | Rep | ||
| 11th | Bob Hasegawa | Dem | Bob Hasegawa | Dem | ||
| 12th | Brad Hawkins | Rep | Brad Hawkins | Rep | ||
| 14th | Curtis King | Rep | Curtis King | Rep | ||
| 16th | Maureen Walsh | Rep | Perry Dozier | Rep | ||
| 17th | Lynda Wilson | Rep | Lynda Wilson | Rep | ||
| 18th | Ann Rivers | Rep | Ann Rivers | Rep | ||
| 19th | Dean Takko | Dem | Jeff Wilson | Rep | ||
| 20th | John Braun | Rep | John Braun | Rep | ||
| 22nd | Sam Hunt | Dem | Sam Hunt | Dem | ||
| 23rd | Christine Rolfes | Dem | Christine Rolfes | Dem | ||
| 24th | Kevin Van De Wege | Dem | Kevin Van De Wege | Dem | ||
| 25th | Hans Zeiger | Rep | Chris Gildon | Rep | ||
| 27th | Jeannie Darneille | Dem | Jeannie Darneille | Dem | ||
| 28th | Steve O'Ban | Rep | T'wina Nobles | Dem | ||
| 38th Special | June Robinson | Dem | June Robinson | Dem | ||
| 39th | Keith Wagoner | Rep | Keith Wagoner | Rep | ||
| 40th | Liz Lovelett | Dem | Liz Lovelett | Dem | ||
| 41st | Lisa Wellman | Dem | Lisa Wellman | Dem | ||
| 49th | Annette Cleveland | Dem | Annette Cleveland | Dem | ||
Source:[6]
Each party flipped a seat and the composition stayed at 28 D–21 R.[7] Senators Dean Takko (D) and Steve O'Ban (R) lost reelection.
| align=center | District 1 • District 2 • District 3 • District 4 • District 5 • District 9 • District 10 • District 11 • District 12 • District 14 • District 16 • District 17 • District 18 • District 19 • District 20 • District 22 • District 23 • District 24 • District 25 • District 27 • District 28 • District 38 • District 39 • District 40 • District 41 • District 49 |