| Tri-Mountain State Park | |
| Photo Width: | 280 |
| Photo Alt: | Landscape |
| Map: | Connecticut#USA |
| Map Width: | 280 |
| Relief: | 1 |
| Label: | Tri-Mountain State Park |
| Location: | Wallingford & Durham, Connecticut, United States |
| Coordinates: | 41.4425°N -72.7408°W |
| Area: | 157acres |
| Elevation: | 748feet |
| Established: | 1925 |
| Designation: | Connecticut state park |
| Administrator: | Connecticut Department of Energy and Environmental Protection |
Tri-Mountain State Park is an isolated public recreation area located in the towns of Wallingford and Durham, Connecticut. The state park encompasses portions of Fowler Mountain and Trimountain. With no road access, the park can only be reached via the Mattabesett Trail. The park originated in 1925 after Wallingford resident John B. Kendrick donated a six-acre parcel on the summit of Trimountain's southern peak that he had purchased for protective purposes in 1906.