The Nectriaceae are a family of fungi in the order Hypocreales. The group was first circumscribed in 1865 by the French mycologists Charles and Louis Tulasne.

According to a 2020 taxonomic review published in the journal Mycosphere, the family comprised 70 recognized genera and approximately 1,336 species.

It is a highly diverse group with a worldwide distribution and it has higher diversity in warm temperate and tropical regions (Rossman et al. 1999; Rossman 2000; Chaverri et al. 2011, Schroers et al. 2011, Hyde et al. 2014, Lombard et al. 2015,). Several authors have studied and revised the taxonomy of Nectriaceae (Petch 1938; Munk 1957; Dennis 1960; Kreisel 1969; Rossman et al. 1999; Lumbsch and Huhndorf 2010; Lombard et al. 2015; Maharachchikumbura et al. 2016b). A recent treatment of Nectriaceae was provided by Wijayawardene et al. (2022), they also accepted 70 genera within the family.

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