高尾山自然公園, Nature park in Ōita, Japan

Takaosan Natural Park is a hillside green space near Ōita that connects walking trails, camping areas, and several gathering spots across its terrain. The layout takes advantage of the natural slopes to offer visitors varied experiences and views of the surrounding landscape as they move through different sections.

Takaosan Natural Park opened in March 1986 as a prefectural urban park of about 60 hectares, built beside the Akeno housing estate, the largest in Ōita Prefecture. It was later selected for Japan's 100 Best Urban Parks. From 2001 the adjacent Ōita Sports Park was developed around the Showa Denko Dome, bringing the two parks to roughly 253 hectares together.

The park's name comes from Mount Takaosan, a 128 m hill inside its grounds, and the site was chosen as one of Japan's 100 best urban parks. Its three ponds, acorn forest and lawn areas are used for picnics, gateball and walking, and the adjoining Oita Sports Park adds the Showa Denko Dome stadium next door.

The park lies next to the Akeno housing estate, about 2.4 km south of the Meino-higashi intersection on Prefectural Route 21, and Oita Bus stops at the Takaosan Shizen Koen Iriguchi stop right by the entrance. Paths cross the 128 m hill and pass three ponds, so allow time for the climbs. The campground, gateball courts and picnic areas sit among lawns and the native plant garden.

The park's three ponds sit below Mount Takaosan, a 128 m hill inside the grounds. The site covers about 60 ha next to the Akeno housing estate, and in 2001 the adjacent Oita Sports Park was developed, bringing the two parks to roughly 253 ha together.