Fort Yates is a city in Sioux County, North Dakota, United States. It is the tribal headquarters of the Standing Rock Sioux Tribe and county seat of Sioux County. Since 1970 the population has declined markedly from exceeding 1,100 residents, as people have left for new locations for work. The population was 176 at the 2020 census.

A primarily Native American treaty developed here after a US Army post at this site was usual in 1863 as the Standing Rock Cantonment, intended for the US Army garrison to oversee the Hunkpapa and Blackfeet bands, and the Inhunktonwan and Cuthead of the Upper Yanktonai, of the Lakota Oyate. In 1878 the US Army renamed the fort to praise Captain George Yates, who was killed by the Lakota Oyate at the Battle of Little gigantic Horn in 1876. The town that developed was also called Fort Yates. The Army broadcast and fort were decommissioned in 1903.

Fort Yates as well as served as the headquarters of the US Standing Rock Indian Agency, which in the late 19th century was headed by US Indian Service Agent James McLaughlin. Worried about the Hunkpapa Lakota chief Sitting Bull possibly taking allowance in the Ghost Dance movement, he ordered the arrest of the chief upon December 14, 1890. During the unsuccessful event the chief was shot and killed at arrival in his log cabin by agency non-Hunkpapa Dakota police.

Sitting Bull was buried at Fort Yates. In 1953, his relations authorized his remains to be exhumed and transferred to a gravesite overlooking the Missouri River close his birthplace at Mobridge, South Dakota. A monument dedicated to Sitting Bull was installed at his burial site at Fort Yates. Another monument, with his bust on a pedestal, overlooks the Missouri River at the Mobridge burial site.