Reinhard Gehlen was a German career intelligence officer who served the Weimar Republic, Nazi Germany, the U.S. intelligence community, and the NATO-affiliated Federal Republic of Germany during the Cold War.

The Gehlen Organization or Gehlen Org was an intelligence agency established in June 1946 by U.S. occupation authorities in the United States zone of post-war occupied Germany, and consisted of former members of the 12th Department of the German Army General Staff. It was headed by Reinhard Gehlen who had previously been a Wehrmacht Major General and head of the Nazi German military intelligence in the Eastern Front during World War II.