| Election Name: | 1979 Philadelphia mayoral election |
| Country: | Philadelphia |
| Type: | presidential |
| Ongoing: | no |
| Previous Year: | 1975 |
| Next Year: | 1983 |
| Election Date: | November 8, 1979 |
| Turnout: | 60%[1] 5 pp |
| Image1: | File:William J. Green (1).jpg |
| Nominee1: | William J. Green III |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 313,345 |
| Percentage1: | 52.59% |
| Nominee2: | David W. Marston |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 174,083 |
| Percentage2: | 29.22% |
| Image3: | File:Lucien Blackwell.jpg |
| Nominee3: | Lucien Blackwell |
| Party3: | Consumer |
| Popular Vote3: | 108,447 |
| Percentage3: | 18.20% |
| Mayor | |
| Before Election: | Frank Rizzo |
| Before Party: | Democratic Party (United States) |
| After Election: | William J. Green III |
| After Party: | Democratic Party (United States) |
The 1979 Philadelphia mayoral election saw the election of William J. Green III.
Ahead of the election there had been an unsuccessful effort to amend the city charter to allow incumbent mayor Frank Rizzo to run for a third consecutive term.[2]
Marston was unopposed for the Republican nomination.