Halo can refer to:
- Halo - a circular glow around the head in Christian art.
- halo (optical phenomenon) - an optical phenomenon.
- HALO - a military parachuting technique.
- Halo: Combat Evolved - a game for the Xbox game console.
- Halo - designation given to every Nine Inch Nails official release —singles, remixes and/or EPs— where the Halo number indicates the order in which they were released.