Guillaume Daniel Delprat CBE (1 September 1856 – 15 March 1937) was a Dutch-Australian metallurgist, mining engineer, and businessman.
[1] Delprat was born in Delft, the Netherlands, son of Major General Felix Albert Theodore Delprat (1812–1888), later minister of war, and his wife Elisabeth Francina, née van Santen Kolff.
Delprat attended a high school in Amsterdam and later became an apprentice engineer on the Tay Bridge in Scotland.
On returning to the Netherlands, he is said to have acted as assistant to Johannes Diderik van der Waals, physics professor at the University of Amsterdam.
[3] G. D. Delprat married Henrietta Maria Wilhelmina Sophia Jas (died 5 December 1937) in Holland on 4 September 1879.