Baron Willem van Dedem, also styled as Willem, Baron van Dedem, (1929–2015) was a Dutch businessman, art collector, art historian and philanthropist.
[1] After donating five works to the Mauritshuis, he was awarded both the Museum Medal and the Officer's Cross of the Order of Orange-Nassau.
[3] He was president of the board of The European Fine Art Fair (TEFAF).
At various times, the collection included works by Rembrandt, Pieter Claesz and Adriaen Coorte.
[3] His great uncle was the shipping magnate Daniel George van Beuningen.