| Election Name: | 1925 San Diego mayoral election |
| Flag Image: | Flag of San Diego, California.svg |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1923 San Diego mayoral election |
| Previous Year: | 1923 |
| Next Election: | 1927 San Diego mayoral election |
| Next Year: | 1927 |
| Nominee1: | John L. Bacon |
| Party1: | Republican Party (US) |
| Popular Vote1: | 11,653 |
| Percentage1: | 50.3% |
| Nominee2: | Fred A. Heilbron |
| Party2: | Republican Party (US) |
| Popular Vote2: | 6,056 |
| Percentage2: | 26.1% |
| Mayor | |
| Before Election: | John L. Bacon |
| Before Party: | Republican Party (US) |
| After Election: | John L. Bacon |
| After Party: | Republican Party (US) |
The 1925 San Diego mayoral election was held on March 24, 1925, to elect the mayor for San Diego. Incumbent mayor John L. Bacon stood for reelection to a third term. In the primary election, Bacon received a majority of the votes and was elected outright with no need for a contested runoff.
Incumbent Mayor John L. Bacon stood for reelection to a third term. On March 24, 1923, Bacon received an absolute majority of 50.3 percent in the primary election, more than 24 percent higher than his nearest competitor, Fred A. Heilbron. Bacon received one hundred percent of the vote in the uncontested runoff election held April 7, 1925 and was elected to the office of the mayor.
Because Bacon won outright in the primary with a majority of the vote, his was the only eligible name on the runoff ballot.