| Election Name: | 2016 Los Angeles County Board of Supervisors elections |
| Flag Image: | File:Flag of Los Angeles County, California.svg |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 2014 Los Angeles County Board of Supervisors election |
| Previous Year: | 2014 |
| Next Election: | 2018 Los Angeles County Board of Supervisors election |
| Next Year: | 2018 |
| 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: | 4 |
| Seat Change1: | 1 |
| Party2: | California Republican Party |
| Seats Before2: | 2 |
| Seats2: | 1 |
| Seats After2: | 1 |
| Seat Change2: | 1 |
| Map Size: | 250px |
The 2016 Los Angeles County Board of Supervisors elections were held on June 7, 2016. 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. A run-off election was held for the Fourth and Fifth Districts on November 8, 2016, as no single candidate failed to reach a majority vote.
Michael D. Antonovich and Don Knabe, incumbent Supervisors for the Fourth and Fifth Districts respectively, were termed out.
| Election Name: | 2016 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: | 2012 Los Angeles County Board of Supervisors election |
| Previous Year: | 2012 |
| Next Election: | 2020 Los Angeles County Board of Supervisors election |
| Next Year: | 2020 |
| Image1: | Mark Ridley-Thomas, 2013.jpeg |
| Candidate1: | Mark Ridley-Thomas |
| Popular Vote1: | 237,100 |
| Percentage1: | 100.00% |
| Supervisor | |
| Before Election: | Mark Ridley-Thomas |
| Posttitle: | Supervisor |
| After Election: | Mark Ridley-Thomas |
| Election Name: | 2016 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: | 2012 Los Angeles County Board of Supervisors election |
| Previous Year: | 2012 |
| Next Election: | 2020 Los Angeles County Board of Supervisors election |
| Next Year: | 2020 |
| Image1: | Janice Hahn, official portrait, 112th Congress.jpg |
| Candidate1: | Janice Hahn |
| Popular Vote1: | 166,298 |
| Percentage1: | 47.13% |
| Candidate2: | Steve Napolitano |
| Popular Vote2: | 129,313 |
| Percentage2: | 36.65% |
| Image4: | 3x4.svg |
| Candidate4: | Ralph Pacheco |
| Popular Vote4: | 57,256 |
| Percentage4: | 16.23% |
| Supervisor | |
| Before Election: | Don Knabe |
| Posttitle: | Supervisor |
| After Election: | Janice Hahn |
| Election Name: | 2016 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: | 2012 Los Angeles County Board of Supervisors election |
| Previous Year: | 2012 |
| Next Election: | 2020 Los Angeles County Board of Supervisors election |
| Next Year: | 2020 |
| Image1: | File:Supervisor_Kathryn_Barger.jpg |
| Candidate1: | Kathryn Barger |
| Popular Vote1: | 105,520 |
| Percentage1: | 29.64% |
| Candidate2: | Darrell Park |
| Popular Vote2: | 55,185 |
| Percentage2: | 15.50% |
| Image3: | 3x4.svg |
| Candidate3: | Bob Huff |
| Popular Vote3: | 52,359 |
| Percentage3: | 14.71% |
| Image4: | Ara Najarian.jpg |
| Candidate4: | Ara James Najarian |
| Popular Vote4: | 46,587 |
| Percentage4: | 13.08% |
| Image5: | Mitchell Englander, 2014.jpg |
| Popular Vote5: | 42,823 |
| Percentage5: | 12.03 |
| Image6: | 3x4.svg |
| Candidate6: | Elan Carr |
| Popular Vote6: | 40,580 |
| Percentage6: | 11.40 |
| Supervisor | |
| Before Election: | Michael D. Antonovich |
| Posttitle: | Supervisor |
| After Election: | Kathryn Barger |