Ordnance

Ordnance may refer to:

Military

 * Weapons and ammunition:
 * Military logistics, especially provision of weapons and ammunition
 * Ordnance weapon, a personal weapon issued to a member of a military unit
 * Aircraft ordnance, weapons carried by and used by an aircraft
 * Artillery often in the formal name, e.g. as in Ordnance Survey
 * Artillery shells, specifically unexploded ordnance

Other

 * Ordnance Datum (from use in ballistics), a vertical datum used as the basis for deriving altitudes on maps
 * Ordnance, Oregon, United States, a former community near the Umatilla Chemical Depot