| Philo H. Olmsted | |
| Office1: | 8th and 12th Mayor of Columbus |
| Term Start1: | 1838 |
| Term End1: | 1839 |
| Predecessor1: | Warren Jenkins |
| Successor1: | John G. Miller |
| Term Start2: | 1833 |
| Term End2: | 1833 |
| Appointer2: | Columbus Burough Council |
| Predecessor2: | William Long |
| Successor2: | John Brooks |
| Party: | Whig |
| Profession: | Mayor Newspaper editor Tavern owner Hotel manager Retailer Member of Burough Council Member of the Ohio House of Representatives |
| Birth Date: | 26 February 1793 |
| Birth Place: | Simsbury, Connecticut, US |
| Death Place: | Columbus, Ohio, US |
| Restingplace: | Green Lawn Cemetery, Columbus, Ohio |
| Spouse: | Sarah Phillips |
| Children: | 12 |
Philo Hopkins Olmsted (February 26, 1793 – February 20, 1870) was the eighth mayor and 12th mayor of Columbus, Ohio. He was also the eighth person to serve in that office. He served Columbus for three years during non-consecutive terms. His successor after 1833 was John Brooks and after 1839 was John G. Miller.