| Election Name: | 2018 Los Angeles County Board of Supervisors elections |
| Flag Image: | File:Flag of Los Angeles County, California.svg |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 2016 Los Angeles County Board of Supervisors election |
| Previous Year: | 2016 |
| Next Election: | 2020 Los Angeles County Board of Supervisors election |
| Next Year: | 2020 |
| 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: | 0 |
| Seats After2: | 1 |
| Map Size: | 250px |
The 2018 Los Angeles County Board of Supervisors elections were held on June 5, 2018. Two of the five seats (for the First and Third Districts) of the Los Angeles County Board of Supervisors were contested in this election.