Fort Peck is a town in Valley County, Montana, United States. The population was 239 at the 2020 census.

The name Fort Peck is united with Col. Campbell K. Peck, the partner in crime of Elias H. Durfee in the Leavenworth, Kansas trading solution of Durfee and Peck. In 1867, company employee Abe Farwell constructed the Fort Peck trading proclaim along the Missouri River, which enjoyed a virtual monopoly in trade considering the Sioux and Assiniboine people. After its quick life as a trading post, Fort Peck served as an Indian agency from 1873 until 1878. At that time, the agency was moved to its current location at Poplar. Fort Peck had a read out office from 1879 to 1881.

A additional town of Fort Peck, located nearly two miles north of the original, was built in 1934 to home Army Corps of Engineers employees in force in the construction of the Fort Peck Dam. Designed to be temporary, the government-owned town nevertheless included many features of a surviving town, including an administrative headquarters, a hospital, stores, a theater, a recreation hall, and supplementary facilities. Totally inadequate to house the 10,000-plus employees, Fort Peck was soon united by numerous shanty towns, including Wheeler, New Deal, Delano Heights, and Park Grove. The Fort Peck Original Houses Historic District, the Fort Peck Theatre, and the hospital, administration building, and further associated public works properties are listed in the National Register.

The Administration Building, the Employee’s Hotel and Garage, the Garage and Fire Station, the Hospital, and the Recreation Hall of the government-run town are listed upon the National Register of Historic Places.