Icelus may refer to:

Icelus or Icelos, another name for Phobetor, in Ovid's Metamorphoses Icelus (fish), a genus of fishes Icelus, a freedman who served the Roman Emperor Galba before his downfall A character in Saint Seiya: The Lost Canvas

See also Erynnis icelus, (dreamy duskywing), a butterfly