The male Scarlet Honeyeater can be confused with the male Red-headed Honeyeater, M. erythrocephala, where their ranges overlap (east coast of Cape York Peninsula). It can be distinguished by having more extensive red colouring over the back and down the breast. Female and immature Scarlet Honeyeaters may be confused with similarly coloured honeyeaters, including females and immatures of the Red-headed and the Dusky Honeyeater, M. obscura, as well as the Brown Honeyeater, Lichmera indistincta. They differ from the Red-headed in being more olive-brown and lack red on the forehead. They are smaller and more compact than the Dusky, with a shorter bill and tail, as well as having different calls. They are smaller than the Brown Honeyeater and lack this species' eyespot.