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The Avro Shackleton was a military aircraft. A four piston-engine design named after Sir Ernest Shackleton, it served with the Royal Air Force in Anti-submarine warfare (ASW), maritime patrol aircraft (MPA), Airborne Early Warning (AEW), Search and rescue (SAR) and other roles from 1951 until 1990. It also served in the South African Air Force from 1957 to 1984.

The aircraft was designed by Roy Chadwick as the Avro Type 696. It was clearly based on the Avro Lincoln and the successful wartime Avro Lancaster, which was the then current ASW aircraft. The design took the Lincoln's wings and landing gear and mated them with a new fuselage. The engines were using Rolls-Royce Griffon s with 13 feet (4 m) contra-rotating propellors, creating a distinctive engine noise and adding high-tone deafness to the hazards of the pilots. The first test flight was in March 1949 and front-line aircraft were delivered to Coastal Command in April 1951 and had their operational debut during the Suez Crisis.

The Mk. II was improved with feedback from operations and is considered by aficionados to be the definitive type. The radome was moved from the nose to a ventral position, to improve all-round coverage and minimise the risk of bird-strikes. Both the nose and tail sections were lengthened, the tail planes were redesigned and the weak undercarriage was strengthened.

The Mk. III was another redesign in response to crew complaints. A new tricycle undercarriage was introduced, the fuselage was increased in all main dimensions and had new wings with better ailerons and tip tanks. In a sop to the crews on fifteen hour flights the sound deadening was improved and a proper galley and sleeping space were included. Total take-off weight had risen by over 30,000 lb (13,600 kg) (Ph. III) and assistance from Rolls-Royce Viper 203 turbojets was needed on take-off. This extra strain told on the airframe and the flight life of the Mk. IIIs was sufficiently reduced that they were outlived by the Mk. IIs.

All marks suffered from using the Griffon engines - thirsty, noisy and temperamental, they were constantly on the cusp of being replaced but even the potentially beneficial Napier NomadThe Nomad was a complex Diesel cycle aircraft engine from Napier & Son of the UK. The Nomad used a turbine to recover power from the exhaust of the otherwise conventional Diesel engine, resulting in a specific fuel consumption that remains unmatched today re-engine didn't quite happen.

In ASW the Shackleton carried both types of sonobuoyA sonobuoy is a buoy with a sonar attached to it. They are used to extend the sonar capabilities of aircraft, particularly for anti-submarine warfare. An aircraft may deploy many buoys in an area of ocean, and then correlate information transmitted from t, ESM , a diesel fume detection system and for a short time an unreliable magnetic anomaly detectorA magnetic anomaly detector (MAD) is a piece of equipment that is used to detect minute variations in the Earth's magnetic field. The term refers specifically to magnetometers used by military forces to detect submarines. Such a mass of ferromagnetic mate (MAD) sytem. Weapons were nine bombs, or three torpedoA modern torpedo is a self-propelled guided projectile that operates underwater and is designed to detonate on contact or in proximity to a target. Torpedoes are weapons that may be launched from submarines, surface ships, helicopters and fixed-wing aircres or depth-charges, and 20 mm cannon.

The need to replace the Shackleton was first raised in the early 1960s. The arrival of the BAe Nimrod in 1969 was the end for the Shackleton in most roles but it continued as the main SAR aircraft until 1972. The intention to retire the aircraft was then thwarted by the need for AEW converage in the North Sea and northern Atlantic following the retirement of the Fairey GannetThe Fairey Gannet was a carrier-borne Anti-submarine warfare and Airborne Early Warning aircraft of the immediate post World War II-era developed for the Royal Navy Fleet Air Arm. It has been called "the ugliest aircraft in the world". The Gannet's wings. With a new design not due until the late 1970s the existing AN/APS-20 radar was installed in Mk. IIs as an interim measure, the AEW.2, from 1972. The disastrous Nimrod AEW replacement program dragged on and on and the eventual successor to the Shackleton did not arrive until the RAF finally gave in and purchased the E-3 Sentry in 1991.

A total of 185 Shackletons were built from 1951 to 1958: around twelve are still believed to be intact, with one still flying.