The Cecil M. Buffalo Jr. House is a historic house at 16324 Arch Street Pike in Landmark, Arkansas. It is a single-story semi-circular structure, finished mainly in glass and fieldstone, with some vertical board siding. The outside portion of the semi-circle is mainly finished with sliding glass doors, while the inside portion has more windows. The building is topped by a flat roof. The house was built in 1968 to a design by Oklahoma architect Dean Bryant Vollendorf, and is a good example of his "Baysweep" style.
The house was listed on the National Register of Historic Places in 2018.