SM U-10 or U-X was the lead boat of the U-10 class of submarines for the Austro-Hungarian Navy (German: Kaiserliche und Königliche Kriegsmarine or K.u.K.

SM UB-1 was constructed in Germany and shipped by rail to Pola where she was assembled and launched in January 1915.

She was commissioned into the German Imperial Navy later that same month and sank an Italian torpedo boat in June.

[8] SM UB-1 was commissioned into the German Imperial Navy under the command of Oberleutnant zur See Franz Wäger on 29 January.

[3] On 4 June 1915, after being disassembled into three sections and transported by rail to Pola for reassembling,[7] UB-1 was handed over to the Austro-Hungarian Navy and commissioned as U-10 under the command of Linienschiffsleutnant Karl Edler von Unczowski.

[9] On 9 July 1918, U-10 hit an Italian mine near Caorle in the northern Adriatic Sea at position 45°30′N 13°00′E / 45.500°N 13.000°E / 45.500; 13.000,[10] and was beached with heavy damage.

Although she was looted by Austro-Hungarian Army troops, she was later towed to Trieste for repairs, which remained unfinished at war's end; all of the 13 crew personnel were saved.