Eucalyptus protensa is a species of mallee that is endemic to the southwest of Western Australia.

Eucalyptus protensa is a mallee, sometimes a tree, that typically grows to a height of 4–10 m (13–33 ft) but does not form a lignotuber.

[2][3][4] Eucalyptus protensa was first formally described in 1991 by Lawrie Johnson and Ken Hill from material collected 60 km (37 mi) east of Norseman in 1983.

[3][5] The specific epithet (protensa) is from the Latin protensus meaning "stretched out" or "extended", referring to the long operculum.

[2][4] This mallee is classified as "not threatened" by the Western Australian Government Department of Parks and Wildlife,[4]