Greycliff Prairie Dog Town State Park, Prairie dog observation area in southeastern Montana, United States.

Greycliff Prairie Dog Town State Park covers 98 acres (40 ha) on the eastern edge of Greycliff, in Sweet Grass County, Montana, between Bozeman and Billings. It protects a colony of black-tailed prairie dogs. Facilities are limited to parking areas, picnic tables and interpretive displays about the animals' life and their role in the prairie ecosystem.

The site was bought by The Nature Conservancy and then sold to Montana Department of Fish, Wildlife and Parks, with funds from the Montana State Long Range Building Fund and the National Park Service. The park covers 98 acres (40 ha) at the eastern edge of Greycliff, in Sweet Grass County, and protects a black-tailed prairie dog colony.

Interpretive signs throughout the park explain how prairie dogs organize themselves into social groups and support other wildlife in the grassland ecosystem. You can watch their interactions directly and learn why these animals matter for the health of the prairie.

Access is from Exit Greycliff off Interstate 90, which runs along the northeast side of the 98-acre park. The facilities are limited to parking areas, picnic tables and interpretive panels; visitors must pack out their own trash. Pets are allowed.

Black-tailed prairie dogs were already described in 1804 by Lewis and Clark, at another stop on their expedition, long before this 40-hectare site near Greycliff became a park. The Nature Conservancy bought the land first, then sold it to Montana Fish, Wildlife and Parks using money from the Montana State Long Range Building Fund and the National Park Service.