Lieutenant General Eugène De Greef (31 August 1900 – 14 February 1995[citation needed]) was a Belgian Minister of Defence, serving under two successive Belgian prime ministers (first Pholien, then Van Houtte) between 1950 and 1954.

His tenure coincided with Belgian intervention in the Korean War, as well as important negotiations about the European Defence Community.

De Greef was from a Walloon family Though De Greef was not the minister who took the decision to send Belgian soldiers to the UN mission in Korea, he held office through the entire duration of the conflict.

De Greef's own son, Captain Guy de Greef (described as "a superb officer"[1]) commanded C Company of the Belgian Volunteer Corps in Korea in 1953, at the Battle of Chatkol.

De Greef was involved in the negotiations of the European Defence Community and North Atlantic Treaty Organization.