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Picromerus lewisi Scott (Hemiptera: Pentatomidae) is a widely used natural enemy, through this study, we proved that its complete mitochondrial genome of it had similar characteristics to those of other Hemiptera. The mitogenome of P. lewisi is a circular molecule of 18,123 bp with 74.0% A + T content, containing 13 protein-coding genes (PCGs), 22 tRNAs, 2 rRNAs, and one control region. Phylogenetic tree based on 13 PCGs from 17 Panheteroptera species (two species of the Cimicomorpha are used as outgroup, 15 species belong to the Pentatomomorpha) suggested that P. lewisi has a closer relationship with E. thomsoni within Pentatomidae family.