John Leydon

John Leydon (17 January 1895 – 2 August 1979) was an Irish civil servant, who served in a number of significant roles in ministerial departments and was involved in the setting up and development of a number of semi-state organisations such as Irish Shipping (first chairman), Aer Rianta (served as director and chairman), Aer Lingus (served as chairman), and the Institute of Public Administration (which he served as its first president).

Leydon was educated at St. Mel's College, Longford, before going to Maynooth College as a seminarian, he did not pursue the priesthood, and instead joined the British civil service in 1915. A devout Catholic, he was a member of the Legion of Mary, whose founder Frank Duff, was a close friend and best man at Leydon's wedding.