The Ordnance QF 13-pounder Mk IV anti-aircraft gun was an Elswick Ordnance commercial 3 inch 13-pounder gun of which 6 were supplied during World War I.

The Ordance QF 13-pounder MK IV is unrelated to the other British Mks 13-pounder.

Precise theaters of service are difficult to ascertain due to writers often not differentiating between various Mks of 13-pounder guns.

2 guns are known to have been operated by 99th Anti-Aircraft Section at Salonika from July 1917 until the end of the war.

The overall appearance is of a standard 13-pounder with an additional, slightly longer, recuperator cylinder on top.