Kosoma is a ghost town and former railroad station in Pushmataha County, Oklahoma, United States. It is located just off Oklahoma State Highway 2, about 10 miles (16 km) north of Antlers.
Kosoma is located in a rugged but scenic area. It is adjacent to the Kiamichi River at the base of Big Mountain, also known as Deer Mountain. Close by is Lost Mountain, notable for its relative cone shape and location in the middle of the Kiamichi River valley, apart from other mountains. The area of the valley floor on which Kosoma was built is bracketed by two locally prominent and well-watered streams: Buck Creek to the south and Pine Creek to the north.
A permanent settlement has existed at the site of modern Kosoma since at least the 1880s. During the 1880s, the St. Louis-San Francisco Railway, more popularly known as the “Frisco”, built a line from north to south through the Choctaw Nation, connecting Fort Smith, Arkansas with Paris, Texas. The railroad paralleled the Kiamichi River throughout much of its route in present-day Pushmataha County. Train stations were established every few miles to aid in opening up the land and, more particularly, to serve as the locations of section houses. Supervisors for their respective miles of track lived in the section houses to administer the track and its right-of-way. These stations also served as points at which the trains could draw water.
The site of the future Kosoma was selected because of its proximity to the Kiamichi River, with its abundant water supply. Adjacent station stops were established at Wadena, four miles to the north, and Moyers, three miles to the south.