The Aermacchi or Macchi MB-326 is a light military jet trainer designed and produced by the Italian aircraft manufacter Aermacchi. It is one of the most commercially successful aircraft of its type, being bought by more than 10 countries and produced under licence in Australia, Brazil and South Africa.

A jet trainer is a jet aircraft for use as a trainer, whether for basic or advanced flight training. Jet trainers are either custom designs or modifications of existing aircraft. With the introduction of military jet-powered aircraft towards the end of the World War II it became a requirement to train pilots in the handling of such aircraft.