John Vesey, 6th Viscount de Vesci

John Eustace Vesey, 6th Viscount de Vesci (25 February 1919 – 13 October 1983), was an Irish peer.

Early life He was the son of Lt. Col. Hon. Thomas Eustace Vesey and Lady Cecily Kathleen Browne, daughter of Valentine Browne, 5th Earl of Kenmare. He was the great-grandson of Thomas Vesey, 3rd Viscount de Vesci. His father was an Eton and Oxford-educated Lieutenant Colonel in the Irish Guards who fought and was wounded twice in the First World War.

Career He became the Viscount de Vesci of Abbey Leix on 16 August 1958. He succeeded his paternal uncle, the 5th Viscount, who was survived by his widow, Lois (daughter of Sir Cecil Edmund Lister-Kaye, 4th Bt., and widow a first time of the 5th Earl of Rosse and mother of the 6th Earl of Rosse). This acquisition added 1,648 books (about 2,900 volumes) and 54 serials (about 390 volumes) to the National Library of Australia. She was the daughter of barrister Ronald Armstrong-Jones and of Anne Parsons, Countess of Rosse. When she married Lord de Vesci, she converted to Catholicism.