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Sustainable strategies such as classical or augmentative biological control are currently being evaluated for the long-term management of the alien invasive pest <i>Halyomorpha halys</i> (Stål) (Hemiptera: Pentatomidae). A three-year study carried out in northeastern Italy was performed to investigate the distribution and field performance of the <i>H. halys</i> egg parasitoid <i>Trissolcus mitsukurii</i> (Ashmead) (Hymenoptera: Scelionidae), in comparison with other parasitoid species. In the study area, adventive populations of <i>T. mitsukurii</i> were present since 2016, representing the earliest detection of this species in Europe. <i>Trissolcus mitsukurii</i> was the most abundant parasitoid and showed a higher “parasitoid impact” (i.e., number of parasitized eggs over the total number of field-collected eggs) compared to the other species, i.e., <i>Anastatus bifasciatus</i> (Geoffroy) (Hymenoptera: Eupelmidae), <i>Trissolcus</i> <i>basalis</i> (Wollaston) and <i>Trissolcus</i> <i>kozlovi</i> Rjachovskij (Hymenoptera: Scelionidae). The hyperparasitoid <i>Acroclisoides sinicus</i> (Huang and Liao) (Hymenoptera: Pteromalidae) was also recorded. Phylogenetic analysis of <i>T. mitsukurii</i> population distinguished two clades, one covering samples from Italy, Japan and China, the other from South Korea. The present study provides promising results for the biological control of a pest that is having a dramatic impact on a wide range of crops worldwide.