Major-General Sir Justin Sheil KCB (2 December 1803 – 18 April 1871) was an Irish army officer and diplomat, the British envoy in Persia from 1844 to 1854.

[1] On 16 February 1836 Sheil was appointed secretary to the British legation in Persia, and in 1844 he succeeded Sir John McNeill as envoy and minister at the Shah's court.

[1] Sheil contributed notes on Koords, Turkomans, Nestorians, Khiva, ..., to a book Glimpses of Life and Manners in Persia (London, 1856),[2] written by his wife.

of the Royal Geographical Society's Journal "Notes of a Journey from Kurdistan to Suleimaniyeh in 1836", and "Itinerary from Tehran to Alamut in May 1837".

They had ten children, including the politician Edward Sheil, Mary Emily (died 1888), who married her cousin, the leading journalist John Woulfe Flanagan, and Laura, who married the Spanish diplomat Pedro de Zulueta and was the mother of Francis de Zulueta, Regius Professor of Civil Law (Oxford) at the Regius Professor of Law.