In classical mythology, Nisus or Nisos may refer to:
- Nisos, a king of Megara.
- Nisus, son of Hyrtacus, lover of Euryalus.
- Silenus, also called Nisus, foster father of Dionysus.
- Nissus of Dulichium, son of Aretias, father of Amphinomus.
Nisus may also refer to:
- Nisus Writer, a word processor for the Apple Macintosh.
nisus in German: Nisos (Begriffsklärung)
nisus in Lithuanian: Nisas
nisus in Russian: Нис