The Air Training Corps (ATC) is a cadet organisation based in the United Kingdom. It is a voluntary youth group which is affiliated to and supported by the Royal Air Force, however the cadets and majority of staff are civilians. It is not a recruiting organisation, although a number of its members do go on to join the RAF or other services.

With almost 53,000 members, aged from 13 to 20 years old, in over 1,000 Squadrons nation wide, the Air Training Corps is one of the country's premier youth organisations. The Cadets are encouraged and supported by volunteer staff and Civilian Committee members numbering over 14,000.

The Air Training Corps has three aims:

    To promote and encourage among young people a practical interest in aviation and the Royal Air Force.
    To provide training which will be useful in the Services and civilian life.
    To foster the spirit of adventure and develop qualities of leadership and good citizenship.

The Air Training Corps Motto is "Venture Adventure".

HRH The Duke of Edinburgh serves as honorary Air Commodore-in-Chief.

The Air Training Corps was founded by a Royal Warrant signed by King George VI on 5 February 1941 in response to a shortage of pilots. It was formed out of the Air Defence Cadet Corps by Air Commodore Adrian Chamier. It proved very popular during the war, as cadets who passed their proficiency training in the Air Training Corps could choose which service they wished to join when they were conscripted; they were also excused several weeks of basic training should they join the RAF.