The Miles M.14 Magister is a two-seat monoplane basic trainer aircraft designed and built by the British aircraft manufacturer Miles Aircraft. It was affectionately known as the Maggie.^{[citation needed]} It was authorised to perform aerobatics.

The Magister was developed during the 1930s to Specification T.40/36, itself based on the existing Miles Hawk Trainer which had been ordered in small numbers. The first prototype's maiden flight was on 20 March 1937. It quickly became praised for its handling qualities, and was ordered into quantity production.

Entering service barely a year before the start of the Second World War, the Magister became a key training aircraft. It was the first monoplane designed as a trainer to be used by the Royal Air Force (RAF). During the war it was purchased in large numbers for the RAF, the Fleet Air Arm and various overseas military operators. It proved an ideal introduction to the Spitfire and Hurricane for new pilots.^{[citation needed]}

After the war surplus Magisters were exported in large numbers, with many converted for civilian use.

The origin of the Miles Magister was a decision made by the company's management in 1936 to further develop its military trainer range; this decision was influenced by the firm's recent success with the Miles M.2 Hawk Trainer as an elementary trainer, the first low-wing monoplane to be adopted as a trainer by the Royal Air Force (RAF). It was decided to produce a derivative of the Hawk Trainer to satisfy the Air Ministry's Specification T.40/36. The submission ignored the policy of only procuring metal aircraft which the RAF had at the time.

The new type was broadly similar to the Hawk Trainer: the majority of the differences between the two pertained to the cockpit, which was enlarged and had numerous new features to better meet military training requirements. The first prototype made its maiden flight on 20 March 1937, flown by F.G. Miles. During the following month, the aircraft was named the Magister. During early flights the aircraft exhibited a tendency to spin; this problem was solved by several modifications, including elevating the tailplane by 6 in (15 cm), the fitting of anti-spin strakes to the rear fuselage and the adoption of a taller rudder. The alterations worked so well that the Magister became the first low-wing cantilever monoplane to be authorised by the Air Ministry to perform aerobatics.

The Magister is a low wing cantilever monoplane whose design is derived from Miles' Hawk Trainer. Noticeable differences include the significant enlargement of the cockpit, since a more spacious cockpit was required to reasonably accommodate the presence of parachutes and various training aids, including the provision of blind-flying apparatus. The open cockpits have windscreens made of Perspex; baggage and unused equipment can be stored in a sizable bay aft of the rear cockpit via an exterior door. Pilots are required to enter and exit the aircraft via a wingroot walkway on the starboard side.

The Magister is largely built of wood, the fuselage consisting of a spruce structure with a plywood covering; similar materials were used for the three-piece wing and the tail unit. The wing centre section has no dihedral and is of constant section with outer sections having dihedral and tapering towards the tip. It has split flaps as standard; it was the first RAF trainer to have flaps. It has a fixed tailwheel undercarriage with drag-reducing spats on the main wheels; to reduce the landing distance, the undercarriage was fitted with Bendix drum brakes. Power is provided by a 130 hp de Havilland Gipsy Major engine and the fuel is contained in a pair of tanks in the centre section.