The mangrove honeyeater (Gavicalis fasciogularis) is a species of bird in the honeyeater family Meliphagidae. The species was once considered to be conspecific with the varied honeyeater, but it is now treated as a separate species. These two species form a genus with the singing honeyeater.
It is endemic to Australia, where it is restricted to the eastern coast from Townsville in Queensland to northern New South Wales. The species has been expanding its range southward in recent years. The mangrove honeyeater is generally locally common over most of its range, but is rarer in the south.
Mangrove Honeyeaters are small to medium-sized nectar eating birds. Its plumage is olive-brown above, grading to greyish-brown on rump and uppertail-coverts, with fine dark streaking on top of head and hindneck. There is olive mottling on uppertail-coverts and broad black mask extending well down side of neck. A narrow yellow moustachial stripe exists that ends in small white tuft. It meets large greyish-white patch on lower side of neck and the tail and upperwing are olive-brown in color. The chin and throat are finely barred dark grey-brown and dull yellow in color. Its legs are colored in dark grey or bluish-grey. The back is dark-grey; only the flight feathers have yellowish-olive leading edges. The irises are dark blue-grey. The slightly down-curved bill is dark-grey.