Ludwig Gehre (5 October 1895 – 9 April 1945) was an officer and resistance fighter involved in the preparation of an assassination attempt against Hitler.
Gehre was born in Düsseldorf. Little detail is known of his early years in the parental home and the education he received. The first reference to Gehre appears when he was a managing director of a building contractor. In 1928 he published a study on Clausewitz; by that time he is supposed to have begun his career as an officer in the Reichswehr.
At the beginning of the Second World War Gehre was active as a Captain in the Abwehr (Military Intelligence) under Admiral Wilhelm Canaris. By 1939 a group in the Abwehr had formed to remove the Nazi regime and end the War. This circle included Admiral Canaris, General Ludwig Beck, Hans von Dohnanyi, Hans Oster, and Dietrich Bonhoeffer, as well as Gehre.
By March 1943 Gehre was privy to the Military Opposition's preparations under Henning von Tresckow to assassinate Hitler. In January 1944 Helmuth James Graf von Moltke was arrested, and in March 1944 Gehre was also taken by the Gestapo. Gehre, however, was soon able to flee and disappeared.
After the failed 20 July 1944 assassination attempt to kill Hitler, the search for Gehre intensified. Gehre, together with his wife, kept himself hidden for several more weeks. Further shelter was procured by the brothers Hans and Otto John. When Gehre realized that he was about to be discovered by the Gestapo on 1944 November 2, he shot his wife and then directed the gun toward himself. Although he was badly hurt, he survived.