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Leucoagaricus naucinus (Fr.) Singer is a mycorrhizal fungus widely distributed in the northern Hemisphere. In the present study, the complete mitochondrial genome of Leucoagaricus naucinus was sequenced, assembled, and annotated. The L. naucinus mitochondrial genome was composed of circular DNA molecules, with the total size of 61,434 bp. The GC content of the L. naucinus mitochondrial genome was 26.07%. A total of 30 protein-coding genes (PCGs), two ribosomal RNA (rRNA) genes, and 26 transfer RNA (tRNA) genes were detected in the L. naucinus mitochondrial genome. Phylogenetic analysis based on combined mitochondrial gene dataset indicated that the L. naucinus exhibited a close relationship with Agaricus bisporus.