The conservation of bison in North America is an ongoing, diverse effort to bring American bison back from the brink of extinction. Plains bison, a subspecies, are a keystone species in the North American Great Plains. Bison are a species of conservation concern in part because they suffered a severe population bottleneck at the end of the 19th century. The near extinction of the species during the 19th century unraveled fundamental ties between bison, grassland ecosystems, and indigenous peoples’ cultures and livelihoods. English speakers used the word buffalo for this animal when they arrived. Bison was used as the scientific term to distinguish them from the true buffalo. Buffalo is commonly used as it continues to hold cultural significance, particularly for Indigenous people.

The Lamar Buffalo Ranch is a historic livestock ranch in the Lamar River valley of Yellowstone National Park, in the U.S. state of Wyoming. As an early contribution to the conservation of bison, it was created to preserve one of the last free-roaming American bison (buffalo) herds in the United States. The ranch was established in 1907 when 28 bison were moved from Fort Yellowstone to the Lamar Valley in the northeast corner of the park.