Makoshika State Park, State park in Glendive, Montana, United States.

Makoshika is a state park near Glendive featuring over 11,000 acres of badlands terrain with steep ravines, colorful rock layers, and exposed earth formations. The grounds include a visitor center with exhibits, camping areas, hiking trails, an archery range, and an amphitheater for ranger programs.

In 1938 the Glendive Chamber of Commerce proposed a badlands national park, but the National Park Service judged the site not of national significance. The state park was created in 1939 when Dawson County donated 160 acres; another 80 acres followed in 1953. Later acquisitions from the Bureau of Land Management, the county and private owners expanded it to more than 11,000 acres. The badlands expose the Hell Creek Formation, a non-marine deposit yielding Triceratops and Thescelosaurus fossils.

The name Makoshika derives from the Lakota Mako sica, meaning "bad land" or "land that is bad." The park hosts an annual "Buzzard Day" celebration, timed to the return of turkey vultures that nest in the badlands.

The park lies on the southeast side of Glendive, and its badlands rise between roughly 650 and 810 metres above sea level. Trails and the scenic drive cross bare, sun-exposed slopes, so carry water and wear boots with grip. The visitor centre holds the fossil displays and is the place to orient yourself before heading out.

A complete skeleton of a Thescelosaurus was discovered in the park in 1997, a rare find that helped scientists learn more about this small dinosaur species. This discovery is one reason why the park remains especially valuable to paleontologists.