Custer State Park is a state park located in the Black Hills of South Dakota, USA. Established in 1919, it covers an area of over 71,000 acres and is known for its scenic drives, wildlife, and outdoor recreation opportunities.

The park is home to a wide variety of wildlife, including bison, pronghorn, elk, deer, bighorn sheep, mountain lions, and coyotes. The park is also known for its scenic drives, including the Needles Highway, which winds through rock formations and tunnels, and the Wildlife Loop Road, which offers the opportunity to view bison and other wildlife up close.

Outdoor activities in the park include hiking, camping, fishing, horseback riding, and rock climbing. The park also features several lakes for swimming and boating, including Sylvan Lake, which is a popular spot for swimming and kayaking.

One of the most popular events in the park is the annual Buffalo Roundup, which takes place each September. During the roundup, park staff and volunteers gather the bison for veterinary care and to adjust the herd size. The roundup also includes a variety of events and activities, including a pancake breakfast, an arts festival, and a cowboy poetry gathering.

Custer State Park is also home to several historic sites, including the Black Hills Playhouse, which has been producing plays since 1946, and the State Game Lodge, which served as the "Summer White House" for President Calvin Coolidge in 1927.