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- Sac & Fox Nation of Missouri in Kansas and Nebraska
- Sac & Fox Nation, Oklahoma
- Sac & Fox Tribe of the Mississippi in Iowa
- Saginaw Chippewa Indian Tribe of Michigan
- Saint Regis Mohawk Tribe, New York
(formerly the St. Regis Band of Mohawk Indians of New York) - Salt River Pima-Maricopa Indian Community of the Salt River Reservation, Arizona
- Samish Indian Nation
(previously listed as Samish Indian Tribe, Washington) - San Carlos Apache Tribe of the San Carlos Reservation, Arizona
- San Juan Southern Paiute Tribe of Arizona
- San Manuel Band of Mission Indians, California
(previously listed as San Manuel Band of Serrano Mission Indians of the San Manuel Reservation, California) - San Pasqual Band of Diegueno Mission Indians of California
- Santa Rosa Band of Cahuilla Indians, California
(formerly the Santa Rosa Band of Cahuilla Mission Indians of the Santa Rosa Reservation) - Santa Rosa Indian Community of the Santa Rosa Rancheria, California
- Santa Ynez Band of Chumash Mission Indians of the Santa Ynez Reservation, California
- Santee Sioux Nation, Nebraska
(formerly the Santee Sioux Tribe of the Santee Reservation of Nebraska) - Sauk-Suiattle Indian Tribe
(previously listed as Sauk-Suiattle Indian Tribe of Washington) - Sault Ste. Marie Tribe of Chippewa Indians of Michigan
- Scotts Valley Band of Pomo Indians of California
- Seminole Tribe of Florida
(previously also listing its reservations:)- Dania Reservation
- Big Cypress Reservation
- Brighton Reservation
- Hollywood Reservation
- Tampa Reservation
- Seneca Nation of Indians
(previously listed as Seneca Nation of New York) - Seneca-Cayuga Tribe of Oklahoma
- Shakopee Mdewakanton Sioux Community of Minnesota
- Shawnee Tribe
(previously listed as Shawnee Tribe, Oklahoma) - Sherwood Valley Rancheria of Pomo Indians of California
- Shingle Springs Band of Miwok Indians, Shingle Springs Rancheria (Verona Tract), California
- Shinnecock Indian Nation
(previously listed as Shinnecock Indian Nation, New York) - Shoalwater Bay Indian Tribe of the Shoalwater Bay Indian Reservation
(previously listed as Shoalwater Bay Tribe of the Shoalwater Bay Indian Reservation, Washington) - Shoshone Tribe of the Wind River Reservation, Wyoming
- Shoshone-Bannock Tribes of the Fort Hall Reservation of Idaho
- Shoshone-Paiute Tribes of the Duck Valley Reservation, Nevada
- Sisseton-Wahpeton Oyate of the Lake Traverse Reservation, South Dakota
- Skokomish Indian Tribe
(previously listed as Skokomish Indian Tribe of the Skokomish Reservation, Washington) - Skull Valley Band of Goshute Indians of Utah
- Smith River Rancheria, California
- Snoqualmie Indian Tribe
(previously listed as Snoqualmie Tribe, Washington) - Soboba Band of Luiseno Indians, California
(formerly the Soboba Band of Luiseno Mission Indians of the Soboba Reservation) - Sokaogon Chippewa Community, Wisconsin
- Southern Ute Indian Tribe of the Southern Ute Reservation, Colorado
- Spirit Lake Tribe, North Dakota
- Spokane Tribe of the Spokane Reservation, Washington
- Squaxin Island Tribe of the Squaxin Island Reservation
(previously listed as Squaxin Island Tribe of the Squaxin Island Reservation, Washington) - St. Croix Chippewa Indians of Wisconsin
- Standing Rock Sioux Tribe of North & South Dakota
- Stillaguamish Tribe of Indians of Washington
(previously listed as Stillaguamish Tribe of Washington) - Stockbridge Munsee Community, Wisconsin
- Summit Lake Paiute Tribe of Nevada
- Suquamish Indian Tribe of the Port Madison Reservation
(previously listed as Suquamish Indian Tribe of the Port Madison Reservation, Washington) - Susanville Indian Rancheria, California
- Swinomish Indians of the Swinomish Reservation of Washington
(previously listed as Swinomish Indians of the Swinomish Reservation, Washington) - Sycuan Band of the Kumeyaay Nation
(formerly the Sycuan Band of Diegueno Mission Indians of California)
Read more about this topic: Federally Recognized Tribes