Ordnance may refer to:
Military and defense
- Materiel in military logistics, including weapons, ammunition, vehicles, and maintenance tools and equipment
- Artillery
- Artillery shells
- Aircraft ordnance, weapons carried by and used by an aircraft
Places
- Ordnance, Oregon, United States
- Ordnance Island, Bermuda
Maps-related
- Ordnance datum (from use in ballistics), a vertical datum used as the basis for deriving altitudes on maps
- Ordnance Survey, the national mapping agency for Great Britain