2018 Orange County Board of Supervisors election

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Orange County Board of Supervisors elections, 2018
3 of 5 seats to the Orange County Board of Supervisors
Republican 60–70% 100% Winners Republican hold Democratic gain No election	Democratic 50–60%

The 2018 Orange County Board of Supervisors elections took place on June 5, 2018, as part of the primary election on June 5, 2018. Three of the five seats of the Orange County, California Board of Supervisors were up for election.

County elections in California are officially nonpartisan. A two-round system was used for the election, starting with the first round in June, followed by a runoff in November between the top two candidates in each district. Runoffs are only held if no candidate receives a majority in each district.