The Lewin's Honeyeater is small to medium in size. It is dark greenish grey in colour, with a creamy yellow gape (fleshy corners of the mouth). It has large, yellowish crescent-shaped ear patches. In flight, the pale yellow edges of the flight feathers can be seen. The bill is black and the eye is blue-grey. Both sexes are similar in appearance. Young Lewin's Honeyeaters are similar to the adults, but have brown eyes.
Lewin's Honeyeater is found in both rainforest and wet sclerophyll forest, and often wanders into more open woodland. It is a common bird, and its call is often heard in these areas.