Stilbella is a genus of fungi in the order Hypocreales. The relationship of this taxon to other taxa within the order is unknown (incertae sedis), and it has not yet been placed with certainty into any family. It is sometimes placed in the family Bionectriaceae (order Hypocreales).

A 1985 monograph included 19 species; more recent estimates place about 60 species in the genus. The type species Stilbella fimetaria (Pers.) Lindau 1905 (syn. Stilbella erythrocephala (Ditmar) Lindau 1900) has a cosmopolitan distribution and grows on herbivore dung. It has pink or orange slimy conidia on white synnemata with phialidic conidiogenous cells. Several species have since been reclassified in other genera based on molecular phylogenetics or the discovery of sexual states, such as Atractium, Stilbocrea, and Trichoderma.

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