| Election Name: | 1929 San Diego mayoral election |
| Flag Image: | Flag of San Diego, California.svg |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1927 San Diego mayoral election |
| Previous Year: | 1927 |
| Next Election: | 1931 San Diego mayoral election |
| Next Year: | 1931 |
| Nominee1: | Harry C. Clark |
| Party1: | Republican Party (US) |
| Popular Vote1: | 15,713 |
| Percentage1: | 58.9% |
| Nominee2: | Patrick F. O'Rourke |
| Party2: | Nonpartisan candidate |
| Popular Vote2: | 7,357 |
| Percentage2: | 27.6% |
| Mayor | |
| Before Election: | Harry C. Clark |
| Before Party: | Republican Party (US) |
| After Election: | Harry C. Clark |
| After Party: | Republican Party (US) |
The 1929 San Diego mayoral election was held on March 19, 1929, to elect the mayor for San Diego. Incumbent mayor Harry C. Clark stood for reelection to a second term. In the primary election Clark received a majority of the votes and was elected outright with no need for a contested runoff.
Incumbent Mayor Harry C. Clark stood for reelection to a second term. On March 19, 1929, Clark received a majority of 58.9 percent of the vote in the primary election. This was more than 30 percent higher than what was received by Patrick O'Rourke, his nearest competitor. Clark received 99.8 percent of the vote in the uncontested runoff on April 2, 1929, and was elected to the office of the mayor.
Because Clark won outright in the primary with a majority of the vote, his was the only eligible name on the runoff ballot.