William Dzus (5 January 1895, Chernykhivtsi, Kingdom of Galicia and Lodomeria, presently Ukraine, - 19 June 1964, New York City, United States) was born Volodymyr Dzhus (Ukrainian: Володимир Джус) and was an American engineer from Eastern Galicia, and the inventor of the Dzus fastener, also known as the quarter-turn fastener.[1] He was also one of the founders of the Ukrainian Institute of America, a cultural foundation,[2] for which he purchased the Harry F. Sinclair House (its current home).