The Melanesian thicketbird or Guadalcanal thicketbird (Megalurulus whitneyi) is a bird species. It used to be placed in the "Old World warbler" family Sylviidae, but it does not seem to be a close relative of the typical warblers; probably it belongs in the grass warbler family Locustellidae. It is found on two Pacific Ocean islands; Guadacanal in the Solomon Islands and Espiritu Santo in Vanuatu. The Melanesian thicketbird is around 16.5 cm long, a slender bird with long legs and a long tail.