Friedrich Karl Klausing (24 May 1920 – 8 August 1944) was a resistance fighter in Nazi Germany, and one of the 20 July Plotters.
He joined the Wehrmacht in the autumn of 1938, belonged to the Potsdam Infantry Regiment 9 and fought and was wounded at the Battle of Stalingrad.
On 11 July 1944, on the first attempt on Hitler's life, Klausing went along with Claus Schenk von Stauffenberg as his adjutant to the Obersalzberg (i.e. the Berghof near Berchtesgaden) and made sure that a car and a plane were standing by, ready to whisk the plotters away to Berlin after the job had been done.
The Obersalzberg plan was, however, put off, as was a second attempt on 15 July at the Wolf's Lair near Rastenburg in East Prussia, where Klausing made the same preparations for Stauffenberg.
On 20 July, Captain Klausing stayed behind at the Bendlerblock in Berlin while Stauffenberg went to the Wolf's Lair to try again, and was jointly responsible for forwarding Operation Valkyrie orders.