Colonel Sir Colin Campbell Scott-Moncrieff KCSI KCMG (3 August 1836 – 6 April 1916) was a British engineer, soldier and civil servant, best known for repairing the Nile Barrage and reorganizing the irrigation system of Egypt in the 1880s.

[2] Retiring with the honorary rank of Colonel,[3] on his way home he was summoned to Cairo to meet Lord Dufferin who offered him "the keys of the Nile" – the position of Director of Irrigation for Egypt, then still nominally part of the Ottoman Empire, but in practice controlled by the British.

His first priority was the Nile Barrage, designed to retain water to irrigate the Delta, which had been built at great expense between 1843 and 1862 but soon abandoned when cracks appeared in its structure.

The results were so successful in terms of improved agricultural yield that he was able to ask for, and get, a million pounds for a complete repair and strengthening of the Barrage, which was carried out between 1885 and 90.

From 1901 to 1903, at the invitation of Lord Curzon, the Viceroy, Scott-Moncrieff served as President of a Commission to investigate and report on the prospects for further developing the Indian irrigation system.