| Day Pond State Park | |
| Photo Width: | 280 |
| Photo Alt: | Pond |
| Map: | Connecticut#USA |
| Map Width: | 280 |
| Relief: | 1 |
| Label: | Day Pond State Park |
| Location: | Colchester, Connecticut, United States |
| Coordinates: | 41.5567°N -72.4189°W |
| Area: | 180acres |
| Elevation: | 440feet |
| Established: | 1949 |
| Designation: | Connecticut state park |
| Administrator: | Connecticut Department of Energy and Environmental Protection |
Day Pond State Park is a public recreation area covering in the town of Colchester, Connecticut. The state park abuts Salmon River State Forest and is managed by the Connecticut Department of Energy and Environmental Protection. The park offers opportunities for hiking, swimming, shoreline fishing, picnicking and mountain biking.
Foundation stones and the park's pond are the few remaining signs of the pioneering Day family, who built the pond to provide waterpower to operate the family sawmill. The land became a state park in 1949.
The park is designated for trout management and offers shoreline fishing on Day Pond. The pond covers about and reaches a depth of a little over . Park trails connect with approximately five miles of trails in the adjoining state forest.
A multi-drop waterfall can be found along Day Pond Brook, dropping a total height of 40abbr=offNaNabbr=off. The falls were once not well known and could not be accessed without bushwhacking. But in 2010, a spur trail was created by a Boy Scout to provide easier access to the falls for the public.