Dennisiella is a genus of fungi in the family Coccodiniaceae. It has 9 species. The genus was circumscribed by mycologists Augusto Chaves Batista and Raffaele Ciferri in 1962, with Dennisiella babingtonii designated as the type species. The generic name honours British mycologist R. W. G. Dennis. Fungi in this genus are epifoliar; that is, they live on living plant surfaces, particularly leaves.