Klaus Bonhoeffer (5 January 1901 – 23 April 1945) was a German jurist and resistance fighter against the Nazi régime who was executed after the July 1944 plot to kill Hitler.
Klaus Bonhoeffer was born in Breslau, Germany, now Wrocław, Poland, to Karl Bonhoeffer, a professor of psychiatry and neurology, and his wife Paula (née von Hase), as their third son. His younger brother was the theologian Dietrich Bonhoeffer (4 February 1906 – 9 April 1945). As a child, he went to the Grunewald-Gymnasium in Berlin with Hans von Dohnanyi.
He studied law at Heidelberg and received a doctorate for his thesis, "Workers' Committees as an Organ of the Workers' Coöperative" (Die Betriebsräte als Organ der Betriebsgenossenschaft). He also had further training in Berlin, at the University of Geneva, and in Amsterdam. On 3 September 1930, he wed Emmi Delbrück, who was Hans Delbrück's daughter, and Justus and Max Delbrück's sister.
He worked as a lawyer and from 1935 as a legal adviser for Deutsche Luft Hansa, serving from 1937 to 1944 as chief syndic. This job took him on many business trips, even during the war.