Clarius can refer to:
Apollo, Greek and Roman God also known as Apollo Clarius, see Clarus Clarius, a small stream in Cyprus which ran near the town of Aepeia (Cyprus). Clarius also means "more brightly" in Latin Clarius or Pseudo-Clarius, monk once thought to be the author of the Chronicle of Saint-Pierre-le-Vif of Sens Isidorus Clarius, religious scholar Birgit Clarius, German heptathlete Clarius, a planet in the Clyph star system of the Milky Way Galaxy in the Marvel Universe (see Features of the Marvel Universe)
See also Clarus (disambiguation) Clarias, fish family