Blackfin tuna, Thunnus atlanticus is a widespread epipelagic oceanic species in the western Atlantic. So far the mitochondrial genome of this species remained unknown, although the mitogenomes of all congeners are known. The mitochondrial genome encodes for 13 proteins, 21 tRNAs, 2 ribosomal RNAs and the gene synteny is conserved with other previously reported mitogenomes of tunas.