Hot Springs State Park is a public recreation area in Thermopolis, Wyoming, known for its hot springs, which flow at a constant temperature of 135 °F (57.2 °C).

[3] The petroglyph site at Legend Rock, some 25 miles (40 km) away, is also part of the park.

The land on which the state park sits was a cession agreement, and the ceded portion was purchased from the Eastern Shoshone by the federal government in 1896, when Indian Inspector James McLaughlin negotiated a purchase price of $60,000 for a 100-square-mile portion (260 km2) of the Shoshone reservation.

[8] The park features a suspension foot bridge across the Big Horn River, picnic shelters, boat docks, flower gardens, and terraces made of naturally forming travertine (calcium carbonate) caused by a flowing mineral hot spring.

[3] The park area encompasses commercial hotels and several state-run and privately operated entities including the Gottsche Rehabilitation Center, Hot Springs County Memorial Hospital, the historic Callaghan Apartments/Plaza Hotel, the Star Plunge waterpark, the Tepee Pools waterpark, and the Wyoming Pioneer Home, a state-run, assisted-living facility.