A Trichopria sp. (Hymenoptera: Diapriidae) was found to be an endophagous pupal parasitoid of the black soldier fly, Hermetia illucens (L.), at two caged-layer poultry operations in south Georgia. The life cycle of the Trichopria parasitoid averaged 32 days, and a mean of 96 ± 21 parasitoids emerged from each parasitized black soldier fly pupa. Parasitism of soldier fly pupae collected during the summer (June-September) ranged from 21 to 32%, whereas those collected during the winter (October-April) ranged from 0 to 4% parasitism. Though parasitoids could be reared from both soldier fly larvae and pupae, laboratory preference tests resulted in only soldier fly pupae being attacked. Trichopria sp. were never observed ovipositing on or emerging from house fly larvae or pupae.