Interwar military aircraft are military aircraft that were developed and used between World War I and World War II, also known as the Golden Age of Aviation.
For the purposes of this list this is defined as aircraft that entered service into any country's military after the armistice on 11 November 1918 and before the Invasion of Poland on 1 September 1939.
Aircraft are listed alphabetically by their country of origin. Civilian aircraft modified for military use are included but those that remained primarily civilian aircraft are not.
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Blackburn Aircraft Limited was a British aircraft manufacturer from 1914 to 1963 that concentrated mainly on naval and maritime aircraft.
Arado Flugzeugwerke was a German aircraft manufacturer, originally established as the Warnemünde factory of the Flugzeugbau Friedrichshafen firm, which produced land-based military aircraft and seaplanes during the First and Second World Wars.
Aichi Kokuki KK was a Japanese aerospace manufacturer which produced several designs for the Imperial Japanese Navy. After the war, the company was reorganized as Aichi Machine Industry Co., Ltd (愛知機械工業) where they made small kei cars until 1966 when they were integrated into Nissan and developed the Nissan Sunny and Nissan Vanette.
A triplane is a fixed-wing aircraft equipped with three vertically stacked wing planes. Tailplanes and canard foreplanes are not normally included in this count, although they occasionally are.
765 Naval Air Squadron was a Naval Air Squadron of the Royal Navy's Fleet Air Arm. It formed at RNAS Lee-on-Solent, in May 1939, as a Seaplane School and Pool squadron. The squadron moved to RNAS Sandbanks, in August 1940, where it undertook the Seaplane Flying Training Course Part I. Lieutenant Commander J.B. Wilson was appointed as dual officer in charge of the air base, and Commanding officer of 765 NAS. By the middle of 1943, dedicated Seaplane Training schools ended and the squadron disbanded in the October. 765 NAS reformed at RNAS Charlton Horethorne, in early February 1944, as a Travelling Recording Unit. The squadron moved to RNAS Lee-on-Solent in March, before moving to RNAS Worthy Down on one month later during April, then in May it moved to RNAS Stretton, were it remained during June.
Observation seaplanes are military aircraft with flotation devices allowing them to land on and take off from water. Their primary purpose was to observe and report enemy movements or to spot the fall of shot from naval artillery, but some were armed with machineguns or bombs. Their military usefulness extended from World War I through World War II. They were typically single-engine machines with catapult-launch capability and a crew of one, two or three. Most were designed to be carried aboard warships, but they also operated from seashore harbors.