A new species, Acacia splendens Maslin & C.P. Elliott, is described and illustrated. It is most closely related to A. microbotrya Benth. and A. daphnifolia Meisn. and is geographically restricted to near Dandaragan, Western Australia. Acacia splendens is Declared Rare Flora (ranked as Endangered) under the Western Australian Wildlife Conservation Act 1950 and is also listed as Endangered under Commonwealth legislation.