Otthia is a genus of fungi in the family Botryosphaeriaceae. There are about 76 species. The genus name of Otthia is in honour of Gustav Heinrich Otth (1806-1874), who was a Swiss mycologist and military officer. The genus was circumscribed by ex. Karl Wilhelm Gottlieb Leopold Fuckel in Jahrb. Nassauischen Vereins Naturk. vol.23-24 (Symb.Mycol.) on page 169 in 1870.