Carex bonanzensis, the Yukon sedge, or the bonanza sedge, is a species of sedge in the family Cyperaceae.^[1] It was described by Nathaniel Lord Britton in 1901.^[2]

Carex bonanzensis on average reaches a height of 20–50 cm (8–19.5 in), with red tinged-pale brown leaves at 10–25 cm (4–10 in) long. Flowers are a brown-orange color. Fruiting occurs June through August, at semi-freezing temperatures within the Subarctic region, and warmer temperatures within the south.^[3]

Carex bonanzensis is native to parts of Siberia and other sections of the Subarctic region, primarily within far north Canada, mid-Russia, and far northeastern Russia.^[2] It grows at elevations of 50–900 m, which are referred to as "lowlands".^[3]

Carex bonanzensis is fairly common throughout its vast range, hence being mostly unscathed by average human and non-human threats. The IUCN Red List has not officially evaluated the species yet, but may do so in the future.^[3]

Carex bonzanensis has no recorded uses, although there may have been native uses before the species initial discovery; most likely being used by Subarctic tribes.^[3]