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The Sisseton Wahpeton Oyate of the Lake Traverse Reservation (Dakota: Sisíthuŋwaŋ Waȟpéthuŋwaŋ oyáte, formerly Sisseton-Wahpeton Sioux Tribe/Dakota Nation, is a federally recognized tribe comprising two bands and two subdivisions of the Isanti or Santee Dakota people. They are on the Lake Traverse Reservation in northeast South Dakota.

The Lake Traverse Reservation and its boundaries were established by the Lake Traverse Treaty of 1867. From 1884 until the 1913, the tribal government was based upon the concept of the Soldier's Lodge. Due to external pressures from federal Indian agents and religious missionaries, as well as internal turmoil, in 1913 the tribe created an advisory committee. It served as the basis of government until 1946.

In 1934 the federal government urged the tribe to adopt the provisions of the Wheeler-Howard Act, also known as the Indian Reorganization Act. By 1946 the tribe had reorganized, establishing the current system of bylaws and elected tribal government at Agency Village. It gained self-government again as the federally recognized Sisseton Wahpeton Sioux Tribe. The authority was based in the Lake Traverse Treaty of 1867.

From 1946 to 2002, the federally recognized tribe was known as the Sisseton Wahpeton Sioux Tribe. For a brief period in 1994, they identified as the Sisseton-Wahpeton Dakota Nation. During their 2002 tribal general elections, they approved a measure changing the name to Sisseton Wahpeton Oyate, the latter word in the Dakota language meaning "people or nation".