| Election Name: | 1973 St. Louis mayoral election |
| Flag Image: | Flag of St. Louis, Missouri.svg |
| Previous Election: | 1969 St. Louis mayoral election |
| Previous Year: | 1969 |
| Election Date: | April 3, 1973 |
| Next Election: | 1977 St. Louis mayoral election |
| Next Year: | 1977 |
| Turnout: | 21.63% |
| Candidate1: | John Poelker |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 76,601 |
| Percentage1: | 56.93% |
| Candidate2: | Joseph Badaracco |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 57,962 |
| Percentage2: | 43.07% |
| Ongoing: | No |
| Map Size: | 200px |
| Mayor | |
| Before Election: | Alfonso Cervantes |
| Before Party: | Democratic Party (United States) |
| After Election: | John Poelker |
| After Party: | Democratic Party (United States) |
The 1973 St. Louis mayoral election was held on April 3, 1973[1] to elect the mayor of St. Louis, Missouri. It saw the election of John Poelker and the defeat of incumbent mayor Alfonso Cervantes in the Democratic primary.
The election was preceded by party primaries on March 6.[2]