Oak Mountain State Park is a public recreation area located approximately 20 miles (32 km) south of Birmingham in the northeast quadrant of the city of Pelham, Alabama, United States. It is the state's largest state park at 9,940 acres (4,020 ha) and is home to the Alabama Wildlife Center, Oak Mountain Interpretive Center, and Oak Mountain BMX Track. Park activities include hiking, running, mountain biking, swimming, camping, fishing, horseback riding, and golf. The park is managed by the Alabama Department of Conservation and Natural Resources.

Oak Mountain was created when the State Land Act of 1927 granted the park the 940 acres (380 ha) between Double Oak Mountain and Little Oak Ridge. From 1934 to 1941, the park saw improvements made by the Civilian Conservation Corps (CCC) and the Works Progress Administration. Remnants of the CCC era—foundations, bridges and other infrastructure, often made of stone quarried from within the park—can be seen throughout the park. In 1943, the National Park Service (NPS) deeded the state park approximately 8,000 acres (3,200 ha) of surrounding land that the NPS had acquired in the 1930s. Further improvements beginning in 1971 saw development of the golf course, pro shop, cottages, administrative buildings, demonstration farm and campgrounds in the area of Dry Brook basin and adjacent to the park's lakes.

In September 2020, Oak Mountain State Park was one of eleven Alabama state parks awarded Tripadvisor’s Traveler’s Choice Award, which recognizes businesses and attractions that earn consistently high user reviews.

Beach/Day-Use Area - Double Oak Lake has shaded picnic areas, covered pavilions for rent, a beach for public swimming, volleyball courts, and paddle boat rentals.

Fishing - Oak Mountain Fishing Center is located at the north end of the park at the "Back Gate." The park has three fishing lakes, totaling 230 acres (93 ha), stocked with largemouth bass, bream, catfish and crappie. The park sells bait and rents flat-bottomed fishing boats. The park has facilities for launching private boats and allows the use of electric trolling motors. Fishing licenses are required and are available at the park.

Hiking - The park has 25 miles (40 km) of hiking trails that range from easy to moderate in difficulty. The Treetop Nature Trail is an elevated boardwalk where owls, turkey vultures, and other non-releaseable birds housed in large cages may be viewed.

Trail Running - Due to the wide variety of terrain and total combined distance of the park's trails, it is a popular trail running destination. The park hosts many trail races throughout the year, including multiple ultramarathons.

Camping - The park's campground has both primitive and improved primitive campsites. Backcountry camping and equestrian camping are also available.