| Election Name: | 1977 Pittsburgh mayoral election |
| Flag Image: | Flag of Pittsburgh, Pennsylvania.svg |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1973 Pittsburgh mayoral election |
| Previous Year: | 1973 |
| Next Election: | 1981 Pittsburgh mayoral election |
| Next Year: | 1981 |
| Election Date: | November 1, 1977 |
| Nominee1: | Richard Caliguiri |
| Party1: | Independent (United States) |
| Popular Vote1: | 68,902 |
| Percentage1: | 47.9% |
| Nominee2: | Tom Foerster |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 62,860 |
| Percentage2: | 43.7% |
| Nominee3: | Joe Cosetti |
| Party3: | Republican Party (United States) |
| Popular Vote3: | 12,205 |
| Percentage3: | 8.5% |
| Mayor | |
| Before Election: | Richard Caliguiri |
| Before Party: | Independent politician |
| After Election: | Richard Caliguiri |
| After Party: | Independent politician |
The Mayoral election of 1977 in Pittsburgh, Pennsylvania was held on Tuesday, November 1, 1977. The incumbent mayor, Richard Caliguiri, had ascended to the office just 10 months earlier, after longtime mayor Pete Flaherty resigned to take a position in the newly formed Jimmy Carter White House. The former City Council President chose to renounce his lifelong Democratic Party membership for the election and run for his first full term as an Independent.
Allegheny County Commissioner Tom Foerster, a powerful party leader, won the Democratic Primary. He was victorious in a contentious battle over city Controller Frank Luccino and fellow city Councilman Jim Sims.
Caliguiri had originally planned not to seek reelection, but a personal clash with Foerster over environmental issues and mass transit funding led to Caliguiri reentering the race; because the filing deadline for the primary had already passed, the Democrat was forced to run as an independent. With Republican attorney Joe Cosetti a nonfactor in the heavily Democratic city, Caliguiri emerged victorious in a highly contested race between two fixtures of area politics.[1] A total of 143,967 votes were cast.