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Adolf Diekmann (18 December 1914 – 29 June 1944 Normandy) was a German military officer and accused war criminal. Diekmann held the rank of SS-Sturmbannführer (major). He commanded a battalion of the regiment "Das Reich" of the Waffen-SS. Men of this unit were responsible for the massacre at Oradour-sur-Glane, in which 642 inhabitants were killed (245 women, 207 children and 190 men). Diekmann was the senior officer present.
He died on the Normandy front on 29 June 1944. Diekmann was never tried for the acts committed in Bordeaux, but he was found responsible on 12 January 1953 for the massacre of Oradour-sur-Glane. His grave is located in the German cemetery at La Cambe German war cemetery in block 25, row 4, grave 121.