| Election Name: | 2012 Los Angeles County Board of Supervisors elections |
| Flag Image: | File:Flag of Los Angeles County, California.svg |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 2010 Los Angeles County Board of Supervisors election |
| Previous Year: | 2010 |
| Next Election: | 2014 Los Angeles County Board of Supervisors election |
| Next Year: | 2014 |
| Seats For Election: | 3 of the 5 seats of the Los Angeles County Board of Supervisors |
| Party1: | California Democratic Party |
| Seats Before1: | 3 |
| Seats1: | 1 |
| Seats After1: | 3 |
| Party2: | California Republican Party |
| Seats Before2: | 2 |
| Seats2: | 2 |
| Seats After2: | 2 |
| Map Size: | 250px |
The 2012 Los Angeles County Board of Supervisors elections were held on June 5, 2012, coinciding with the Presidential primary elections, June 2012.[1] 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.
| Election Name: | 2012 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: | 2008 Los Angeles County Board of Supervisors election |
| Previous Year: | 2008 |
| Next Election: | 2016 Los Angeles County Board of Supervisors election |
| Next Year: | 2016 |
| Image1: | Mark Ridley-Thomas, 2013.jpeg |
| Candidate1: | Mark Ridley-Thomas |
| Popular Vote1: | 96,943 |
| Percentage1: | 100.00% |
| Supervisor | |
| Before Election: | Mark Ridley-Thomas |
| Posttitle: | Supervisor |
| After Election: | Mark Ridley-Thomas |
The incumbent, Mark Ridley-Thomas, ran unopposed.
| Election Name: | 2012 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: | 2008 Los Angeles County Board of Supervisors election |
| Previous Year: | 2008 |
| Next Election: | 2016 Los Angeles County Board of Supervisors election |
| Next Year: | 2016 |
| Image1: | File:Don Knabe.jpg |
| Candidate1: | Don Knabe |
| Popular Vote1: | 137,176 |
| Percentage1: | 100.00% |
| Supervisor | |
| Before Election: | Don Knabe |
| Posttitle: | Supervisor |
| After Election: | Don Knabe |
The incumbent, Don Knabe, ran unopposed.
| Election Name: | 2012 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: | 2008 Los Angeles County Board of Supervisors election |
| Previous Year: | 2008 |
| Next Election: | 2016 Los Angeles County Board of Supervisors election |
| Next Year: | 2016 |
| Image1: | Supervisor Antonovich.jpg |
| Candidate1: | Michael D. Antonovich |
| Popular Vote1: | 163,343 |
| Percentage1: | 79.55% |
| Candidate2: | Raj Pal Kahlon |
| Popular Vote2: | 41,983 |
| Percentage2: | 20.45% |
| Supervisor | |
| Before Election: | Michael D. Antonovich |
| Posttitle: | Supervisor |
| After Election: | Michael D. Antonovich |