The Short S.81 was an experimental British gun-carrying pusher biplane seaplane, ordered from Short Brothers by the British Admiralty in 1913 for use by the Royal Naval Air Service.

[1] S.81 was delivered to Calshot on 25 May 1914 and accepted by the Navy on 2 June 1914.

[2] It was first fitted with a 1½ pounder (37 mm) semi-automatic Vickers quick-firing gun in July 1914.

No longer needed for trials, it was deleted from the inventory in October 1915.

[1] Data from The British Fighter since 1912[4]General characteristics Performance Armament