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Complete mitochondrial genome (mitogenome) sequences can provide useful and varied information for evolutionary and phylogenetic studies. We report the first complete mitogenome sequence of the bumblebee shrimp (<i>Gnathophyllum americanum</i>). The mitogenome is 15,842 bp in length and contains 13 protein-encoding genes, 2 ribosomal RNA genes, and 22 transfer RNA genes. The nucleotide composition of the mitogenome was as follows: A,36.72%; T,29.62%; C,21.0%; and G,12.66%. The most common start and stop codons are ATG and TAA, respectively. The MGO (mitochondrial gene order) of <i>G. americanum</i> and <i>Hymenocera picta</i> is unique in Decapoda. Both the phylogeny based on mitochondrial genomic DNA data and the unique MGO pattern indicate that the genus <i>Gnathophyllum</i> might be a sister genus to the genus <i>Hymenocera</i>. The mitogenomic sequence data obtained in this study will provide more information on <i>G. americanum</i> for species identification, population genetics, and biogeography.