Scelionid wasps (Hymenoptera: Scelionidae) are powerful egg parasitoids which have an efficient role in the biological control of agricultural pests, especially pentatomids (Hemiptera: Pentatomidae). The species diversity of these beneficial insects from Isfahan province is studied in this paper. Twenty species from 2 subfamilies, Scelioninae and Telenominae, were collected and identified. In this paper, the hosts of reared parasitoids are introduced together with the synonyms of scelionid wasps.