Haplogroup L

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)