Sir William Edmund Garstin (29 January 1849 – 8 January 1925) was a British civil engineer. He was responsible for a number of important hydrological and public works in Egypt.

You can help expand this article with text translated from the corresponding article in German. (April 2022) Click [show] for important translation instructions. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing German Wikipedia article at [[:de:William Edmund Garstin]]; see its history for attribution. You may also add the template {{Translated|de|William Edmund Garstin}} to the talk page. For more guidance, see Wikipedia:Translation.

Garstin was Under Secretary of State for Public Works in Egypt. He held this position during the construction of the Aswan Low Dam across the Nile 1898–1902. For his services to this project he was appointed a Knight Grand Cross of the Order of St Michael and St George (GCMG) in December 1902,^[1] and received the First class of the Ottoman Order of Osmanieh from the Khedive of Egypt.^[2] In early 1903 Garstin and a surveyor travelled the Lake Edward, the Semliki River and the Lake Albert, and visited Mombasa, Uganda, Gondokoro and Khartoum.^[3]

After his death Garstin was cremated at Golders Green Crematorium.

The extinct giant snake Gigantophis garstini was named in his honour.