| Election Name: | 1903 San Francisco mayoral election |
| Country: | San Francisco |
| Flag Image: | Flag of San Francisco (1900-1940).svg |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1901 San Francisco mayoral election |
| Previous Year: | 1901 |
| Next Election: | 1905 San Francisco mayoral election |
| Next Year: | 1905 |
| Image1: | Eugene E. Schmitz 1903 Crop.jpg |
| Candidate1: | Eugene E. Schmitz |
| Party1: | Union Labor Party (California) |
| Popular Vote1: | 26,016 |
| Percentage1: | 43.87% |
| Candidate2: | Henry J. Crocker |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 19,621 |
| Percentage2: | 33.08% |
| Image3: | Franklin Knight Lane 1902 Crop.jpg |
| Candidate3: | Franklin K. Lane |
| Party3: | Democratic Party (United States) |
| Popular Vote3: | 12,578 |
| Percentage3: | 21.21% |
| Mayor | |
| Before Election: | Eugene E. Schmitz |
| Before Party: | Union Labor Party (California) |
| After Election: | Eugene E. Schmitz |
| After Party: | Union Labor Party (California) |
The 1903 San Francisco mayoral election was held on November 3, 1903. Incumbent Eugene E. Schmitz was reelected with 43% of the vote.