Doryssus or Dorissus or Doriagus (Greek: Δόρυσσος) was a king of ancient Sparta, who reigned for 29 years. Pausanias identified him as the son of Labotas or Leobotes and the father of Agesilaus I. He was killed in battle between the Spartans and the Argives.

Preceded byLabotasAgiad King of Sparta c. 840 – c. 820 BCSucceeded byAgesilaus I