| Tonshi Mountain | |
| Location: | Phoenicia, New York, U.S. |
| Coordinates: | 42.0008°N -74.1928°W |
| Coordinates Ref: | [1] |
| Topo: | USGS Bearsville |
| Map: | New York#USA |
Tonshi Mountain is a mountain located in the Catskill Mountains of New York southeast of Phoenicia. Acorn Hill is located northeast, Ohayo Mountain is located east-northeast, and Little Tonshi Mountain is located west-southwest of Tonshi Mountain.