Leptopilina is a genus of parasitoid wasp in the family Figitidae.

The venom released by L. heterotoma during oviposition contains virus-like particles that delay host larval development and suppress the host cellular immune response.

[2][3] There is no evidence that these virus-like particles are the products of viral DNA as described in other parasitoid taxa.

[4] L. japonica is a parasitoid of Drosophila suzukii which is an important pest in fruit production.

[5][6] It was first captured in November 2020 as bycatch from a Vespa mandarinia trap in Washington State[7][8][9] - the first find of this species in the United States.