Short Brothers plc, usually referred to as Shorts or Short, was an aerospace company based in Belfast, Northern Ireland. Shorts was founded in 1908 in London, and was the first company in the world to make production aeroplanes. It was particularly notable for its flying boat designs manufactured into the 1950s.

In 1943, Shorts was nationalised and later denationalised, and in 1948 moved from its main base at Rochester, Kent to Belfast. In the 1960s, Shorts mainly produced turboprop airliners, major components for aerospace primary manufacturers, and missiles for the British Armed Forces.

Shorts was primarily government-owned until being bought by Bombardier in 1989 and, in 2007, was the largest manufacturing concern in Northern Ireland. In November 2020, Bombardier sold its Belfast operations to Spirit AeroSystems. Following a deal to split Spirit Aerosystems' assets, Boeing became the main owner of the Belfast site in December 2025; production facilities relating to Airbus aircraft are leased out to Airbus.

The company's products include aircraft components, engine nacelles and aircraft flight control systems for Bombardier Aerospace, Boeing, Rolls-Royce Deutschland, General Electric and Pratt & Whitney.^{[needs update]}

The Short Brothers business started in 1897 when Eustace Short (1875–1932) bought a second-hand coal gas filled balloon, and, with his brother Oswald, started a company to develop and manufacture balloons. In 1900, the two brothers visited the 1900 Paris Exposition ('World's Fair'), where they saw the balloons of Édouard Surcouf (of Société Astra), who had developed a method of constructing truly spherical balloons.

In 1902, the brothers started offering balloons for sale. They manufactured the balloons at Hove, Sussex, in premises above the acoustic laboratory run by a third brother, Horace (2 July 1872 – 6 April 1917). In 1903, when Horace left to work on steam turbine development with Charles Parsons, Eustace and Oswald moved their workshop to rented accommodation in London, then again to railway arches in Battersea, conveniently situated next to Battersea gas-works.

In 1905, they won a contract for three balloons for the British Indian Army. The quality of their work impressed Colonel James Templer, superintendent of the Royal Balloon Factory, who introduced the brothers to Charles Rolls. Rolls commissioned them to build him a large balloon to compete in the 1906 Gordon Bennett Cup balloon race. More orders soon followed from other members of the Aero Club of Great Britain (later Royal Aero Club).

In 1908, on hearing reports from Aero Club members who had seen the Wright brothers' demonstrations of their aircraft at Le Mans in France, Oswald Short reportedly said to Eustace, "This is the finish of ballooning: we must begin building aeroplanes at once, and we can't do that without Horace!" Oswald succeeded in persuading Horace to leave his job with Parsons, and in November 1908 they registered their partnership under the name Short Brothers. Two orders for aircraft were soon received, one from Charles Rolls, who ordered a glider, and the other from Francis McClean, a member of the Aero Club who later bought several more aircraft from Short Brothers, and also acted as an unpaid test-pilot. At the end of 1908 Horace started work on the two designs, and in early 1909 construction was started of McClean's aircraft, the Short No.1 biplane. In March 1909 it was exhibited, without its fabric covering, at the first British Aero Show held at Olympia. The brothers had obtained the British rights to build copies of the Wright design.