Uncobasidium is a genus of two species of crust fungi in the family Meruliaceae. The genus was circumscribed by mycologists Kurt Hjorstam and Leif Ryvarden in 1978 with the European fungus U. luteolum as the type species. The South American species U. roseocremeum was added to the genus in 2012. The distinguishing feature of Uncobasidium is the basal hook in the basidium.