The Crescent Honeyeater (Phylidonyris pyrrhopterus) is a passerine bird, of the honeyeater family Meliphagidae, native to south-eastern Australia. A member of the genus Phylidonyris, it is most closely related to the common New Holland Honeyeater (P. novaehollandiae) and the White-cheeked Honeyeater (P. niger). Two subspecies are recognised, with P. p. halmaturinus restricted in range to Kangaroo Island and the Mount Lofty Ranges in South Australia.