Horst Kopkow (29 November 1910, Ortelsburg, East Prussia, Germany (now Szczytno, Poland) – 13 October 1996, Gelsenkirchen, Germany) was a Nazi German SS major who worked for German Security police and, after the war, was concealed by British intelligence to use his knowledge during the Cold War.
In May 1942, SS general Reinhard Heydrich extended his responsibilities to include the capture of Soviet parachute agents in Czechoslovakia and Poland.
After Heydrich's death following a British-directed Czech resistance attack, Kopkow's responsibilities were extended to include all allied parachute agents in the German Reich.
According to partially declassified MI5 documents released 2004 in the British National Archives, MI6 hid Kopkow in order to utilize his knowledge further.
Later he gave just two statements to the West German police when they were investigating the disappearance and death of Gestapo chief Heinrich Müller.