Hyrum State Park, State park in Cache County, United States.

Hyrum State Park is a state park and reservoir in Hyrum, Utah, United States. It lies at 4,700 feet (1,400 m) and consists of 265 acres (107 ha) surrounding a 450-acre (180 ha) reservoir. The facilities are located on the northern shore and include 31 RV campsites, restrooms, showers, a ranger station, boat ramp, dock, and trailheads.

The park was established in 1959 as one of the early state recreation areas in northern Utah. It was created to give the growing population of the region a managed outdoor space for leisure.

The park takes its name from Hyrum Smith, brother of LDS founder Joseph Smith. Before the dam, settlers dug a 9-mile canal from the Little Bear River to irrigate crops in Hyrum. The reservoir is a stopover for migratory birds, and visitors watch bald eagles, scoters, long-tailed ducks, ospreys, Franklin's gulls, terns and bank swallows.

The grounds are well signed and easy to navigate, with separate areas for camping, fishing, and boating. Visitors planning water activities or overnight stays should bring the right gear and keep seasonal weather in mind.

The reservoir holds five fish species, including yellow perch, rainbow trout, and largemouth bass, which is an unusually wide range for a body of water this size. In winter, when the ice is thick enough, anglers return for ice fishing, keeping the site active outside the main summer season.