Lake Herman State Park, State park at Lake Herman, South Dakota.

Lake Herman State Park is a South Dakota state park on the shore of 1,350-acre Lake Herman in Lake County. It has 72 campsites with electric hook-ups, 4 cabins, three hiking trails (Abott, Pioneer Adventure and Luce Adventure), a nine-hole disc golf course, and facilities for swimming, fishing, canoeing and cross-country skiing.

Lake Herman was one of three parks created in 1945, when the South Dakota Legislature established the statewide park system; until then Custer State Park, opened in 1919, was the only state-managed park. The park takes its name from Herman Luce, a pioneer who settled near the lake, and his log cabin of 1871 is preserved within the grounds.

The park serves today as a recreational hub where visitors enjoy water activities and outdoor pursuits in a landscape shaped by generations of settlement and use.

The park offers electrical campsites, rental cabins, and boat ramps that see heavy use during peak seasons and weekends. Visitors should prepare for varied weather conditions since the region experiences a continental climate with cold winters and hot summers.

Lake Herman was one of three parks created in 1945 when the South Dakota Legislature established the state park system, alongside Hartford Beach and Oakwood Lakes. Until then Custer State Park, opened in 1919, was the only state-managed park.