Julius (Hope Joseph) (from 1918, Freiherr) Szilassy von Szilas und Pilis (Hungarian: Gyula báró Szilassy de Szilas et Pilis) (21 August 1870 – ? ? 1935) was an Austro-Hungarian diplomat of Hungarian origin serving in various posts including as an envoy to Greece during World War I and, for many years, as Secretary of the Austro-Hungary Legation to Washington, D.C. He was a direct descendant of the British Hope family which owned the famous Hope Diamond.