Gillbeea is a genus of three species known to science, of Australasian rainforest trees, constituting part of the plant family Cunoniaceae. Botanical science has formally published as of August 2000, the names and descriptions of one species growing naturally only (endemic) in New Guinea and two species growing naturally only (endemic) in the Wet Tropics rainforests of north-eastern Queensland, Australia. These two Wet Tropics, NE. Qld species each only grow naturally in different tablelands rainforest regions, separated from each other for millions of years by a relatively narrow belt of drier non–rainforest landscape.