Haplogroup L may refer to: Haplogroup L (Y-DNA), a human Y-chromosome (Y-DNA) haplogroup Macro-haplogroup L (mtDNA), a human mitochondrial DNA (mtDNA) macrohaplogroup that is at the root of the human mitochondrial phylogenetic tree. Its subclades are: Haplogroup L0, a human mitochondrial DNA (mtDNA) haplogroup Haplogroup L1 (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup Haplogroup L2 (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup Haplogroup L3 (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup Haplogroup L4 (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup Haplogroup L5 (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup Haplogroup L6 (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup Haplogroup L7, a human mitochondrial DNA (mtDNA) haplogroup; now Haplogroup L4a (mtDNA)