Rhyssinae is a subfamily of parasitoid wasps in the family Ichneumonidae.

[1][2] All possess long ovipositors, which are used by females to bore into tree trunks to lay eggs on the larvae of horntails and wood-boring beetles.

Females in genus Megarhyssa show very long ovipositors, with M. atrata reaching 14 cm in length.

[3] The oldest reliable discovery of the subfamily in fossil form was made in a German Messel pit (Eocene, about 47 Ma).

[4] The following genera belong to the subfamily Rhyssinae: Data sources: i = ITIS,[5] c = Catalogue of Life,[6] g = GBIF,[7] b = Bugguide.net[8] This Ichneumonidae-related article is a stub.