The Buffalo Commons is a conceptual proposal to create a vast nature preserve by returning 139,000 square miles (360,000 km2) of the drier portion of the Great Plains to native prairie, and by reintroducing the American bison ("buffalo"), that once grazed the shortgrass prairie. The proposal would affect ten states: Montana, Wyoming, Colorado, Oklahoma, New Mexico, Texas, North Dakota, South Dakota, Nebraska, and Kansas.

American Prairie is a prairie-based nature reserve in Central Montana, United States, on a mixed grass prairie ecosystem with migration corridors and native wildlife. This wildlife conservation area is being developed as a private project of the American Prairie Foundation (APF). This independent non-profit organization aims to include over 3 million acres (12,000 km2) through a combination of both private and public lands.