Atsepar, also spelled Otsepor is a former Yurok settlement in Humboldt County, California. Kroeber maps it on the Klamath River south of the confluence of Bluff Creek and the Klamath, but above the confluence with the Trinity River; its precise location is unknown.
- Alfred Louis Kroeber (1925). Handbook of the Indians of California. Courier Dover Publications. pp. 9–. ISBN 978-0-486-23368-0.
- U.S. Geological Survey Geographic Names Information System: Atsepar, California