Oberleutnant Werner von Haeften (9 October 1908-20 July 1944) was an officer in the Wehrmacht, who took part in the military-based conspiracy against Hitler known as the July 20 Plot.

Von Haeften was born in Berlin to Army officer and President of the Reichsarchiv Hans von Haeften. Studied Law in his home town and then worked for a bank in Hamburg until the outbreak of World War II, when he joined the German army.

In 1943, having recovered from a severe wound he had suffered on the eastern front, von Haeften became adjutant to Oberstleutnant Claus Schenk von Stauffenberg, one of the leading figures in the German military resistance movement.

On 20 July 1944 von Haeften accompanied Stauffenberg to the military high command of the Wehrmacht in Rastenburg, East Prussia, where the latter planted a bomb in Hitler's briefing hut. After the detonation, Stauffenberg and von Haeften rushed to Berlin and, not knowing that Hitler had survived the explosion, engaged in a coup d'etat, which would eventually fail.

On the same day, Werner von Haeften, along with Stauffenberg and fellow conspirators General Olbricht and Oberst Albrecht Mertz von Quirnheim , was arrested and condemned to death by General Friedrich Fromm . He was shot by a firing squad in the courtyard of the War Ministry, the Bendler-Block .