Icarius (not to be confused with Icarus) was the name of two mythological characters of note: the son of Oebalus and Batia (or Perieres and Gorgophone), and the father of Erigone.

The first Icarius married Periboea who bore him two daughters, Penelope and Iphthime, as well as five sons. Although not the same person as Icarus, his name would seem to be of similar origin, and for the possibilities see the name of his better-known near namesake.