| Election Name: | 1851 Philadelphia mayoral election |
| Type: | presidential |
| Ongoing: | no |
| Previous Year: | 1850 |
| Next Year: | 1852 |
| Image1: | 3x4.svg |
| Nominee1: | Charles Gilpin |
| Party1: | Whig Party (United States) |
| Popular Vote1: | 9,275 |
| Percentage1: | 70.22% |
| Nominee2: | John Swift |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 3,934 |
| Percentage2: | 29.78% |
| Mayor | |
| Before Election: | Charles Gilpin |
| Before Party: | Whig Party (United States) |
| After Election: | Charles Gilpin |
| After Party: | Whig Party (United States) |
The 1851 Philadelphia mayoral election saw the reelection of Charles Gilpin.
Beginning in 1839, the city operated under a mixed electoral system. Citizens voted for mayor in a general election. If a candidate receive a majority of the vote, they would be elected mayor. However, if no candidate received a majority, the City Council would select a mayor from the top-two finishers.