| Nom tribus | Etats |
| Ohatchee Cherokee Tribe of New York and Alabama | New York |
| Ohlone/Costanoan | Californie |
| Oklewaha Band of Yamassee Seminole Indians | Floride |
| Ooragnak Indian Nation | Michigan |
| Osprey Band of Free Cherokees | New Jersey |
| Ottawa Colony Band of Grand River Ottawa Indians | Michigan |
| Ozark Mountain Cherokee Tribe of Arkansas and Missouri | Arkansas |