Nonnus is a genus of parasitic wasps in the family Ichneumonidae. It is the type and only genus of the tribe Nonnini and the subfamily Nonninae.

Species include: Nonnus antennatus Cresson, 1874 Nonnus atratus Cresson, 1874 Nonnus bicolor (Schmiedeknecht, 1908) Nonnus brethesi Townes, 1966 Nonnus hastulatus (Brues & Richardson, 1913) Nonnus nigrans (Brues & Richardson, 1913) Nonnus punctulatus (Szepligeti, 1916) Nonnus rufithorax (Szepligeti, 1916) Nonnus rufus (Schmiedeknecht, 1908) Nonnus tornator (Fabricius, 1804)

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