The white-plumed honeyeater (Ptilotula penicillata, formerly Lichenostomus penicillatus) is a small passerine bird endemic to Australia. White-plumed honeyeaters are common around water and are often seen in backyards and suburbs with vegetation cover.
The plumage does not differ between the sexes. The distinguishing characteristic is a conspicuous white plume across the neck from the throat to the edge of the nape. The top of head and neck are olive, with a yellow eye-ring surrounding a black-brown to olive-brown eye. Cheeks and ear coverts are yellow-olive, with the rear coverts tipped black, creating a short black stripe along the anterior edge of the neck plume. The chin and throat are dull yellowish-olive.
The upperparts are uniform grey-olive and the uppertail coverts have a yellowish tinge. Upperwing coverts are mostly brown with olive to yellow-olive tips or edges, creating a somewhat scalloped appearance. Remiges are dark brown with yellowish edges to secondaries, forming a yellow-olive panel when the wing is folded. Uppertail is olive-brown with yellow-olive outer edges. Underbody is mainly light brown-grey, with pale yellow streaks in the centre of the breast, pale yellow on the upper belly, flanks and undertail coverts, and cream on the lower belly. Underwing coverts are off-white with brown-grey remiges. Undertail is brownish grey.