Eucalyptus effusa, commonly known as rough-barked gimlet,[2] is a species of mallee or small tree that is endemic to Western Australia.

It has thin, rough bark on the base of the trunk, smooth bark above, linear to narrow lance-shaped adult leaves, flower buds arranged in groups of seven, white flowers and cup-shaped to conical fruit.Eucalyptus effusa is a mallee or small tree that typically grows to a height of 2 to 6 metres (7 to 20 ft) and forms a lignotuber.

[2][3][4] Eucalyptus effusa was first formally described in 1976 by the botanist Ian Brooker who published the description in the journal Nuytsia.

[11][12] Rough-barked gimlet is found on stony rises and plains between the Fraser Range and Balladonia in the Coolgardie and Nullarbor biogeographic regions of Western Australia where it grows in shallow sandy or loamy soils over greenstone or laterite.

[14][7] Both subspecies of Eucalyptus effusa are classified as "not threatened" by the Western Australian Government Department of Parks and Wildlife.