M
- Hermann Maaß, Leading Social Democrat, executed 20 October 1944, Plötzensee Prison
- Colonel Count Rudolf Graf von Marogna-Redwitz, executed 12 October 1944, Plötzensee prison
- Karl Marks, Merchant
- Michael Graf von Matuschka, District President, executed 14 September 1944, Plötzensee Prison
- Colonel Joachim Meichßner, executed 29 September 1944, Plötzensee Prison
- Lieutenant Colonel (General Staff) Karl Michel
- Carlo Mierendorff, SPD (1897–1943)
- Joseph Müller, executed 11 September 1944, Brandenburg-Gőrden prison
- Dr. Otto Müller, Prelate
- Herbert Mumm von Schwarzenstein, Legation Councillor
- Lieutenant Colonel Ernst Munziger
- Helmuth James Graf von Moltke, (1907-1945)
Read more about this topic: List Of Members Of The 20 July Plot