| Election Name: | 1955 San Diego mayoral election |
| Flag Image: | Flag of San Diego, California.svg |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1951 San Diego mayoral election |
| Previous Year: | 1951 |
| Next Election: | 1959 San Diego mayoral election |
| Next Year: | 1959 |
| Nominee1: | Charles Dail |
| Party1: | Democratic Party (US) |
| Popular Vote1: | 42,897 |
| Percentage1: | 50.7% |
| Nominee2: | Harry L. Foster |
| Party2: | Nonpartisan candidate |
| Popular Vote2: | 41,660 |
| Percentage2: | 49.3% |
| Mayor | |
| Before Election: | John D. Butler |
| Before Party: | Republican Party (US) |
| After Election: | Charles Dail |
| After Party: | Democratic Party (US) |
The 1955 San Diego mayoral election was held on April 19, 1955 to elect the mayor for San Diego. Incumbent mayor John D. Butler did not stand for reelection. In the primary election, Charles Dail and Harry L. Foster received the most votes and advanced to a runoff election. Dail was then elected mayor with a majority of the votes in the runoff.
Incumbent Mayor John D. Butler did not stand for reelection. On March 8, 1955, Charles Dail came first in the primary election with 39.4 percent of the vote, followed by Harry L. Foster with 27.5 percent. Because no candidate received a majority of the vote, Dail and Foster advanced to a runoff election. On April 19, 1955, Dail received 50.7 percent of the vote in the runoff and was elected to the office of the mayor.