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Unterseeboot 103 or short U-103 was a German Type Mittel U U-boat during the First World War. U-103 was built on AG Weser in Bremen, launched on June 9, 1917 and commissioned July 15, 1917. She completed 5 tours of duty by commander Claus Rücker and was responsible for the sinking of 8 vessels of total 22.249 gross register tons (GRT).
On May 12, 1918, she attacked the RMS Olympic who was at the time acting as a troop transport for US soldiers. Olympic managed to avoid the torpedo, and rammed the U-boat in retaliation, splitting it in half and sinking it at position 49°16′N, 4°51′W. This would be the only known sinking of a warship by a merchant vessel during the First World War.
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