Nisus or Nisos may refer to:
Classical mythology Nisus of Nisus and Euryalus, son of Hyrtacus, friend of Euryalus, in Virgil's Aeneid Nisos, a king of Megara Nisus or Silenus, foster father of Dionysus Nisus of Dulichium, son of Aretias, father of Amphinomus, in Book 18 of Homer's Odyssey
Other uses HMS Nisus (1810), a Royal Navy 38-gun fifth rate frigate French brig Nisus (1805), a Palinure-class brig of the French Navy Nisus Writer, a word processor for the Apple Macintosh Eurasian sparrowhawk, Accipiter nisus, a small bird of prey in the family Accipitridae