John Leydon (17 January 1895 – 2 August 1979)[1] 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[2] (served as chairman), and the Institute of Public Administration (which he served as its first president).

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.

[3] He was awarded by the Vatican the title Knight Commander with star of the Order of St. Gregory the Great in 1948.

[4] Leydon was awarded an honorary doctorate from the University of Dublin in 1961.

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