| Election Name: | 2020 Los Angeles County Board of Supervisors election |
| Flag Image: | File:Flag of Los Angeles County, California.svg |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 2018 Los Angeles County Board of Supervisors election |
| Previous Year: | 2018 |
| Election Date: | |
| Next Election: | 2022 Los Angeles County Board of Supervisors election |
| Next Year: | 2022 |
| Seats For Election: | 3 of the 5 seats of the Los Angeles County Board of Supervisors |
| Party1: | California Democratic Party |
| Seats Before1: | 4 |
| Seats1: | 2 |
| Seats After1: | 4 |
| Party2: | California Republican Party |
| Seats Before2: | 1 |
| Seats2: | 1 |
| Seats After2: | 1 |
| Map Size: | 250px |
The 2020 Los Angeles County Board of Supervisors elections took place on March 3, 2020, with runoff elections held on November 3, 2020, to elect members of the Los Angeles County Board of Supervisors. Three of the five seats on the board were up for election.
With the election of Holly Mitchell in the second district, the board of supervisors consisted entirely of women for the first time in history.
Municipal elections in California are officially nonpartisan; candidates' party affiliations do not appear on the ballot.
| Election Name: | 2020 Los Angeles County Board of Supervisors election District 2 |
| Flag Image: | File:Flag of Los Angeles County, California.svg |
| Country: | Los Angeles |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 2016 Los Angeles County Board of Supervisors election |
| Previous Year: | 2016 |
| Next Election: | 2024 Los Angeles County Board of Supervisors election |
| Next Year: | 2024 |
| 1Blank: | First round |
| 2Blank: | Runoff |
| Image1: | Mitchell Holly.jpg |
| Candidate1: | Holly Mitchell |
| Color1: | c0c0c0 |
| 1Data1: | 87,914 29.0% |
| 2Data1: | 387,930 60.6% |
| Candidate2: | Herb Wesson |
| Color2: | c0c0c0 |
| 1Data2: | 90,597 29.9% |
| 2Data2: | 252,545 39.4% |
| Image3: | File:LOS ANGELES CHAMBER (14970305895) (cropped).jpg |
| Candidate3: | Jan Perry |
| Color3: | c0c0c0 |
| 1Data3: | 36,099 11.9% |
| 2Data3: | Eliminated |
| Image4: | File:Albert Robles, 2017.jpg |
| Candidate4: | Albert Robles |
| Color4: | c0c0c0 |
| 1Data4: | 32,305 10.7% |
| 2Data4: | Eliminated |
| Candidate5: | Jorge Nuno |
| Color5: | c0c0c0 |
| 1Data5: | 19,850 6.6% |
| 2Data5: | Eliminated |
| Candidate6: | Jake Jeong |
| Color6: | c0c0c0 |
| 1Data6: | 19,511 6.5% |
| 2Data6: | Eliminated |
| Candidate7: | Rene Rigard |
| Color7: | c0c0c0 |
| 1Data7: | 16,452 5.4% |
| 2Data7: | Eliminated |
| Supervisor | |
| Before Election: | Mark Ridley-Thomas |
| Posttitle: | Supervisor |
| After Election: | Holly Mitchell |
The second supervisorial district is the smallest of the five, comprising mostly parts of the South Los Angeles and South Bay areas. It contains the cities of Inglewood, Compton, Carson, and Hawthorne. Incumbent supervisor Mark Ridley-Thomas was term-limited and could not seek re-election.
| Election Name: | 2020 Los Angeles County Board of Supervisors election District 4 |
| Flag Image: | File:Flag of Los Angeles County, California.svg |
| Country: | Los Angeles |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 2016 Los Angeles County Board of Supervisors election |
| Previous Year: | 2016 |
| Next Election: | 2024 Los Angeles County Board of Supervisors election |
| Next Year: | 2024 |
| Image1: | SupervisorHahn.jpg |
| Color1: | c0c0c0 |
| Candidate1: | Janice Hahn |
| Popular Vote1: | 291,618 |
| Percentage1: | 76.2% |
| Color2: | c0c0c0 |
| Candidate2: | Desiree Washington |
| Popular Vote2: | 91,352 |
| Percentage2: | 23.9% |
| Supervisor | |
| Before Election: | Janice Hahn |
| Posttitle: | Supervisor |
| After Election: | Janice Hahn |
The fourth supervisorial district contains most of the South Bay and Gateway Cities areas, as well as parts of the Harbor Region and San Gabriel Valley. It includes the cities of Long Beach, Torrance, Downey, Norwalk, Whittier, and Lakewood. Incumbent supervisor Janice Hahn was first elected in 2016 with 56.3% of the vote.
| Election Name: | 2020 Los Angeles County Board of Supervisors election District 5 |
| Flag Image: | File:Flag of Los Angeles County, California.svg |
| Country: | Los Angeles |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 2016 Los Angeles County Board of Supervisors election |
| Previous Year: | 2016 |
| Next Election: | 2024 Los Angeles County Board of Supervisors election |
| Next Year: | 2024 |
| Image1: | File:Supervisor_Kathryn_Barger.jpg |
| Color1: | c0c0c0 |
| Candidate1: | Kathryn Barger |
| Popular Vote1: | 240,403 |
| Percentage1: | 58.8% |
| Color2: | c0c0c0 |
| Candidate2: | Darrell Park |
| Popular Vote2: | 84,611 |
| Percentage2: | 20.7% |
| Image3: | 3x4.svg |
| Color3: | c0c0c0 |
| Candidate3: | John Harabedian |
| Popular Vote3: | 84,199 |
| Percentage3: | 20.6% |
| Supervisor | |
| Before Election: | Kathryn Barger |
| Posttitle: | Supervisor |
| After Election: | Kathryn Barger |
The fifth supervisorial district is the largest of the five, covering the entire northern half of the county including the Verdugo Mountains, the San Gabriel Mountains, the Antelope Valley, and portions of the San Gabriel Valley. It includes the cities of Santa Clarita, Glendale, Lancaster, Palmdale, Pasadena, Burbank, and Alhambra. Incumbent supervisor Kathryn Barger was first elected in a runoff election in 2016 with 57.9% of the vote.