Wilhelm Franz Canaris (1 January 1887 – 9 April 1945) was a German admiral, and head of the Abwehr, the German military intelligence service, from 1935 to 1944. During the Second World War, he was among the military officers involved in the clandestine opposition to Adolf Hitler and the Nazi regime. He was executed in the Flossenbürg concentration camp for the act of high treason.