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 See also Ordnance Corps (disambiguation)