Roxanne Dunbar-Ortiz is an American historian, writer, professor, and activist based in San Francisco. Born in Texas, she grew up in Oklahoma and is a social justice and feminist activist. She has written numerous books including Blood on the Border: A Memoir of the Contra Years (2005), Red Dirt: Growing up Okie (1992), and An Indigenous Peoples' History of the United States (2014). She is professor emeritus in Ethnic Studies at California State University.

An Indigenous Peoples' History of the United States is a non-fiction book written by the historian Roxanne Dunbar-Ortiz and published by Beacon Press. It is the third of a series of six ReVisioning books which reconstruct and reinterpret U.S. history from marginalized peoples' perspectives. On July 23, 2019, the same press published An Indigenous Peoples' History of the United States for Young People, an adaptation by Jean Mendoza and Debbie Reese of Dunbar-Ortiz's original volume.