Nauplius, Nauplia or Nauplios , may refer to:
Greece-related Nauplius (mythology), in Greek mythology, the son of Poseidon and Amymone, the father of Palamedes, and also the name of an Argonaut Nauplia, a harbor town in Greece
Biology-related Nauplius (larva), a life stage of crustaceans Nauplius (plant), a genus in the family Asteraceae Nauplius, a genus of copepods, considered synonymous with Cyclops (genus) Nauplius, a genus of shrimp, considered synonymous with Alpheus (crustacean) Nauplius (journal), an academic journal covering carcinology
Other 9712 Nauplius, an asteroid