Ernst Gustav Adolf Munzinger (6 July 1887 – 23 April 1945) was a German businessman and lieutenant colonel in Army intelligence.
After World War I, Munzinger became a supporter of the growing National Socialist movement in his home country, Latvia.
In 1933, the Latvian government expelled his family and he moved to Berlin.
At the start of World War II, Munzinger was drafted into counterintelligence under Admiral Wilhelm Canaris, where he came into contact with the growing anti-Nazi group around Hans Oster and Hans von Dohnanyi.
After the unsuccessful assassination attempt of 20 July 1944, he was arrested by the Gestapo and held in Lehrter Straße prison, Berlin.
On the night of April 22–23, 1945, just a few hours before his scheduled release, a special detachment from the Reich Security Main Office murdered him and other prisoners at nearby factory grounds.