Gray langurs or Hanuman langurs, the most widespread langurs of the Indian Subcontinent, are a group of Old World monkeys constituting the entirety of the genus Semnopithecus (from Ancient Greek σεμνός semnós, “revered, august, holy”, and πίθηκος píthēkos, “ape, monkey”). All taxa have traditionally been placed in the single species Semnopithecus entellus.