Sir John Derek Alun-Jones (6 June 1933 – 19 January 2008) was a British businessman and chairman of Ferranti at the time of its merger with US company International Signal and Control (ISC). He was educated at Lancing College and St Edmund Hall, Oxford, where he read Law. He began his career with in 1957, and became managing director of in 1966. He moved to Burmah Oil in 1971, and became a director of Burmah Oil Trading before moving to Ferranti in 1975.