Edward Orpen Moriarty (1824–1896)[2] MA MInstCE was an Australian civil engineer, who undertook a number of important public works in New South Wales in the late nineteenth century.

[1] In 1848, he migrated to New South Wales, initially being employed as assistant in the Surveyor-General's Department undertaking survey work in Queensland under Sir Thomas Mitchell.

[3] Moriarty was made responsible for the Clarence River Entrance Works between 1862 and 1889, where he proposed short breakwaters and rock training walls.

He was also involved in the board for inspecting and maintaining supply of colonial warlike stores, the commission on defence from foreign aggression and was a Captain of the Engineers Corps Volunteer Rifles in 1871–73.

He retired from engineering positions on 31 December 1888 and returned to England, where he died at Southsea, Hampshire, on 18 September 1896, leaving an estate worth £5800.