Joachim Otto August Achatius von Kortzfleisch (3 January 1890 – 20 April 1945) was a German general in the Wehrmacht during World War II.

He angrily refused to obey Operation Valkyrie orders issued by one of the leading conspirators General Friedrich Olbricht and kept shouting ‘the Führer is not dead’ and referring to the oath of loyalty to Hitler.

Kortzfleisch was later shocked to learn that the officer leading the plot was his own distant cousin Claus von Stauffenberg, with whom he had attended a wedding the previous year.

[citation needed] In March 1945, Von Kortzfleisch was commanding the Rhine Bridgehead in Army Group B under Field Marshal Walter Model.

Kortzfleisch and a handful of soldiers were attempting to move through enemy lines to reach Berleburg, when a patrol of the 737th Tank Battalion of the United States Army encountered them at Schmallenberg-Wulwesort, Sauerland.