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Eriocheir leptognathus is a dominant species in the Yangtze River estuary. In this study, we first determined the complete mitochondrial genome (mitogenome) of E. leptognathus. The mitogenome is 16,143 bp in length, consisting of 13 protein-coding genes (PCGs), 22 transfer RNA (tRNA) genes, two ribosomal RNA (rRNA) genes, and one non-coding control region. Initiation codons ATG and ATT were identified in eight and four PCGs, respectively, while stop codons TAA or TAG were found in eleven genes except for two genes which use incomplete stop codon T–. The phylogenetic analysis indicated that three species (E. hepuensis, E.japonica, E. sinensis) and E. leptognathus are very closely related. The complete mitogenome of E. leptognathus can provide population genetics information to further explore the taxonomic status of this species.