One hundred and sixty genera and 400 species of wood-rotting basidiomycetes are reported from 110 native and exotic substrate species on the Hawaiian Islands of Hawai'i, Kaua'i, Lana'i, Maui, Moloka'i, and O'ahu. Forty-one (10.25% of the total) fungal species are considered to cause brown rots, This is approximately the same percentage of brown rot fungi reported in the North American wood-rotting basidiomycetes.