The BAC One-Eleven (BAC-111, BAC 1-11) is a retired early jet airliner produced by the British Aircraft Corporation (BAC).

Conceived by Hunting Aircraft as a 30-seat jet before its merger into BAC in 1960, it was launched as an 80-seat airliner with a British United Airways (BUA) order on 9 May 1961.The prototype conducted its maiden flight