2012 Los Angeles County Board of Supervisors election

The 2012 Los Angeles County Board of Supervisors elections were held on June 5, 2012, coinciding with the Presidential primary elections, June 2012. Three of the five seats (for the Second, Fourth and Fifth Districts) of the Los Angeles County Board of Supervisors were contested in this election. None of the incumbents were termed out.

Second District
The incumbent, Mark Ridley-Thomas, ran unopposed.

Fourth District
The incumbent, Don Knabe, ran unopposed.