The Folland Gnat was a small, swept-wing British subsonic jet trainer and light fighter aircraft developed by Folland Aircraft for the Royal Air Force, and flown extensively by theIndian Air Force.

 Although never used as a fighter by the Royal Air Force (RAF), the Gnat T.1 trainer variant was widely used. The Gnat became well known as the aircraft of the RAF's Red Arrows aerobatic team.

The Gnat was exported to Finland, Yugoslavia and India. The Indian Air Force became the largest operator and eventually manufactured the aircraft under licence. India then developed the HAL Ajeet, a modified and improved variant.