Eurytoma obtusiventris is a species of chalcid wasp in the family Eurytomidae.

It is found in North America and is a parasitoid of Eurosta solidaginis.

The wasp attacks after oviposition but prior to the formation of a gall.

Eurytoma obtusiventris prompts the Eurosta solidaginis larvae to create a pupa, which the wasp will use after consuming its host.

[1] They typically consume the host in autumn and overwinter within the gall, emerging during the summer.