K
- Hermann Kaiser, grammar school teacher
- Jakob Kaiser, CDU co-founder and Chairmen of the Christian Democratic Union of Germany (DDR) (1888–1961)
- Franz Kempner, Retired Ministry Official (Undersecretary of State)
- Albrecht von Kessel, Diplomat, Mission Adviser at the Vatican
- Otto Kiep, Envoy and Chief of the Reich Press Office (1886–1944), executed 23 August 1944, Plötzensee Prison
- Georg Conrad Kißling, farmer
- Lieutenant Colonel Bernhard Klamroth, executed 15 August 1944 by hanging, Plötzensee Prison
- Major Hans Georg Klamroth (1898–1944); executed 26 August 1944 by hanging, Plötzensee Prison
- Captain Friedrich Karl Klausing (1920–1944)
- Ewald von Kleist-Schmenzin, Diplomat (1890–1945) Executed 16 April 1945
- Lieutenant Ewald-Heinrich von Kleist-Schmenzin Born in 1922, the last surviving member of 20 July plot.
- Major Gerhard Knaack
- Dr. Hans Koch, lawyer (1893–1945)
- Heinrich Körner, Union Leader
- Lieutenant Commander Alfred Kranzfelder
- Richard Kuenzer, Councillor
- Major Joachim Kuhn, (1913–1994)
- Elise Auguste Kutznitzki, née von Liliencron
- Elizabeth Kuznitzky, guillotined 30 November 1944, Plötzensee Prison
Read more about this topic: List Of Members Of The 20 July Plot