SM U-154 was one of the 329 submarines serving in the Imperial German Navy in World War I. U-154 was engaged in the naval warfare and took part in the First Battle of the Atlantic. On 11 May 1918, U-154 was torpedoed and sunk in the Atlantic Ocean at 36°51′N 11°50′W / 36.850°N 11.833°W by the Royal Navy submarine HMS E35 with the loss of all 77 of her crew.