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- Jean O'Brien, White Earth Ojibwe, b. 1958
- Samson Occom, Mohegan, 1723–1792, the first Native American known to publish in English
- Orpingalik, Netsilik Inuit, Canada
- Simon J. Ortiz, Acoma Pueblo, b. 1941
- John Milton Oskison, Old Cherokee Nation, 1874–1947
- Louis Owens, Choctaw-Cherokee-descent 1948–2003
Read more about this topic: Native American Writers