Ewald-Heinrich Hermann Konrad Oskar Ulrich Wolf Alfred von Kleist-Schmenzin (10 July 1922 – 8 March 2013[2]) was a German publisher and convenor of the Munich Conference on Security Policy until 1998.

A member of the von Kleist family and an officer in the Wehrmacht during World War II, his parents were active in the German resistance against Adolf Hitler.

The family was firmly monarchist, and his father, Ewald von Kleist-Schmenzin (1890–1945), had been an active opponent of Nazism well before the Second World War broke out.

Like his father, who had criticised Nazi ideology in print as early as 1929, Ewald-Heinrich loathed Hitler and National Socialism from the beginning.

In January 1944, with his father's blessing, he volunteered to replace the wounded Axel Freiherr von dem Bussche-Streithorst in another suicide assassination attempt on Hitler.

[3][4][5] Von Kleist, at 22, was the youngest of the many supporters and helpers at the Bendlerblock in Berlin who carried out an attempt on Hitler's life at the Wolf's Lair, near Rastenburg, in East Prussia on 20 July 1944.