'Ordnance' may refer to:
''Military:''
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Weapon
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Ammunition
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Ordnance disposal, the process by which hazardous devices are rendered safe
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Para-Ordnance, a firearms manufacturer located in Toronto, Canada
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Unexploded ordnance, are explosive weapons that did not explode when they were employed, and still pose a risk of detonation
''Surveying:''
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Ordnance Datum, a vertical datum used by an ordnance survey as the basis for deriving altitudes on maps
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Ordnance Survey, a British government organization that makes and sells maps
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Ordnance Survey Ireland, the mapping agency in the Republic of Ireland
''Places:''
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Ordnance Island, Bermuda, an island, formerly a Royal Army Ordnance Corps depot, within the limits of St. George's town, Bermuda
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USN Submarine Base, Ordnance Island, Bermuda, a U.S. Navy base during the Second World War
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Ordnance, Oregon, a former community near the Umatilla Chemical Depot
See also
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Board of Ordnance, a British government body created in the 15th century
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Bureau of Ordnance, the U.S. Navy's organization responsible for the procurement, storage, and deployment of all naval ordnance
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Explosive Ordnance Disposal Badge, a military badge of the United States Armed Forces
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Naval Ordnance Laboratory, a former United States military research laboratory
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Ordnance Corps, a combat service support branch of the United States Army
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Royal Army Ordnance Corps (RAOC), a former corps of the British Army
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Royal Ordnance, a British public corporation that manufactured explosives, ammunition, and small arms
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Royal Ordnance Factory, the collective name of the UK government's munitions factories in and after World War II
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United States Army Ordnance Museum, a museum located at Aberdeen Proving Ground, in Aberdeen, Maryland