Omega Weapon may refer to:
- The recurring creature and superboss.
- The recurring weapon.
- The ability from Theatrhythm Final Fantasy.
- The ability from Theatrhythm Final Fantasy Curtain Call
Omega (capital: Ω, lowercase: ω; Greek Ωμέγα) is the 24th and last letter of the Greek alphabet. It commonly represents the end or a limit of something, such as the concept of "alpha and omega".