Lydus or Lydos is an adjective or a name based on the adjective for a person or other object from ancient Lydia. It can mean:
Lydus, third king of Maeonia in succession to his father Atys Lydos, 6th century BC vase painter Lydus, John the Lydian, a 6th-century AD Byzantine administrator Lydus, a genus of blister beetle
See also Lud (disambiguation)