Raimund Weisbach (16 September 1886 – 16 June 1970) was an officer of the Kaiserliche Marine, and a U-boat commander during the First World War.
He was the torpedo officer on the German U-boat, the U-20, who saw to the preparation and firing of the torpedo that sank the RMS Lusitania on 7 May 1915.
He went on to become a successful commander, sinking 36 ships before being captured when his submarine was sunk by the Royal Navy.