| Roy Lake State Park | |
| Map: | USA South Dakota |
| Relief: | 1 |
| Location: | Marshall, South Dakota, United States |
| Coordinates: | 45.7097°N -97.4488°W |
| Governing Body: | South Dakota Game, Fish and Parks |
| Website: | Roy Lake State Park |
Roy Lake State Park is a South Dakota state park in Marshall County, South Dakota in the United States. The park is divided in two sections on Roy Lake, and is open for year-round recreation including camping, beaches, swimming, fishing, hiking and boating.[1] The Roy Lake Resort & Lodge is located in the park.[2] Boat ramps are available and visitors can rent boats from the resort.
There are 100 campsites on two campgrounds and 3 cabins.[3]
The name of Roy Lake recalls an incident when a dog named Roy drowned at the lake.[4]