Clonostachys is a genus of fungi in the order Hypocreales and family Bionectriaceae.

Clonostachys has a worldwide distribution and is commonly found in tropical and subtropical regions (Schroers 2001;[2] Domsch et al.

[3] Species in the genus are saprobes, endophytes, plant pathogens and mycoparasites from various habitats including soil (Schroers 2001;[2] Toledo et al. 2006;[4] Zhang et al. 2008;[5] Moreira et al. 2016).

Clonostachys rosea is of interest as a biological pest control agent.

[5] 75 species were included by the Global Biodiversity Information Facility[6] As of 2023, 60 species are listed Species Fungorum:[7] Former species (all are Bionectriaceae, except if mentioned);[7]