Lamar Buffalo Ranch, Historic ranch in Yellowstone National Park, US

Lamar Buffalo Ranch is a historic district in the Lamar River valley of northeastern Yellowstone National Park, Wyoming. Its five buildings date from the early 20th century: a ranger station (1915), a barn (1927), a bunkhouse (1929), a residence moved from Soda Butte in 1938, and a corral.

The ranch was established in 1907, when 28 bison were moved from Fort Yellowstone to the Lamar Valley in the park's northeast corner. The herd was kept as a semi-domesticated source of additional bison for the park's natural herd, and as it grew the animals were released to the open range and interbred with the wild herd. After the ranched bison were integrated, the ranch produced hay to feed wild bison in winter until the 1950s, when the winter feeding program fell from favor.

The bunkhouse interior was remodeled and is now used by Yellowstone Forever, the park's public stewardship institute, which holds classes and seminars there. The site's name comes from the Lamar River valley where the ranch sits.

The bunkhouse, remodeled inside, is used by Yellowstone Forever for classes and seminars; the ranch lies in the Lamar River valley of the park's northeast corner. The five buildings stand close together as a compact historic district, so they can be seen on foot from the road.

The bunkhouse interior was remodeled and is now used by Yellowstone Forever, the park's public stewardship institute, which holds classes and seminars there. The ranch was listed on the National Register of Historic Places on 7 December 1982.