Wilhelm Cornides (20 July 1920 – 15 July 1966) was a Wehrmacht sergeant in World War II, serving in the General Government territory.
He was the author of the Cornides Report, which contains his account of the extermination of Jews at Belzec during the Holocaust.
In December 1946 Cornides became the founder of Europa-Archiv (renamed Internationale Politik in 1995), the first post-war magazine in Allied-occupied Germany.
In 1955 he was instrumental along with Theodor Steltzer, Minister-President of Schleswig Holstein and former member of the dissident Kreisau Circle, in founding the German Council on Foreign Relations (Deutsche Gesellschaft für Auswärtige Politik, DGAP).
Through his mother Cäcilie (Cilla) von Oldenbourg,Cornides was a member of the Oldenbourg family, owners of Oldenbourg Verlag publishers; a German publishing house founded in 1858 by Rudolf Oldenbourg.