| Robert T. Oestreicher | |
| Office: | 45th Mayor of Columbus |
| Birth Date: | 28 February 1894 |
| Birth Place: | Nelsonville, Ohio |
| Restingplace: | Green Lawn Cemetery Columbus, Ohio |
| Term Start: | January 1, 1953 |
| Term End: | 1953 |
| Predecessor: | Jim Rhodes |
| Successor: | Jack Sensenbrenner |
| Party: | Republican |
| Spouse: | Arline Jane |
| Children: | Robert Michael Lynne |
Robert Theodore Oestreicher (February 28, 1894 – February 18, 1955) was an American politician of the Republican party from the U.S. state of Ohio. He was the 45th mayor of Columbus, Ohio and the 41st person to serve in that office. Oestreicher was President of Columbus City Council in 1952 and succeeded to the office of mayor in 1953 after Jim Rhodes resigned his position to become Ohio State Auditor in 1952. During the municipal election of 1953, the electorate had to choose a mayoral candidate to complete the remainder of Rhodes' unexpired term. Oestreicher sought the office, but was opposed and defeated by Democratic party member Jack Sensenbrenner. Oestreicher served 11 months as mayor.