Cyanothamnus westringioides is a species of erect shrub that is endemic to a small area in the southwest of Western Australia.

[2][3][4] This species was first formally described in 1998 by Paul Wilson and given the name Boronia westringioides in the journal Nuytsia from a specimen collected near the road between Hyden and Norseman.

[2][5] In a 2013 paper in the journal Taxon, Marco Duretto and others changed the name to Cyanothamnus westringioides on the basis of cladistic analysis.

[2] Cyanothamnus westringioides grows on loamy sandplains in a small area north of Lake King and east of Hyden.

[2][4] Cyanothamnus westringioides is classified as "Priority Two" by the Western Australian Government Department of Parks and Wildlife[3] meaning that it is poorly known and from only one or a few locations.