The Red-billed Leiothrix, scientifically called Leiothrix lutea, is a bird species related to the Silver-eared Mesia (fig.), which is known by the scientific designation Leiothrix argentauris.

There are several subspecies, but the nominate race has a olive to golden crown, a yellow face, and a dark to blackish submoustachial, and the breast is golden to orange-rufous. As its common name suggests it has a red bill, though the base of the bill is darker, almost blackish. It has a patterned wing with black, yellow and dark orange or red patches.