|Laid down:||24 July 1910|
|Launched:||24 June 1911|
|Commissioned:||5 December 1912|
|Fate:||Sunk 1 November, 1918|
|Displacement:||20,000 t standard|
|Propulsion:||12 Yarrow boilers, with 4 Parsons steam turbines, totalling 27,000 hp on 4 shafts|
|Speed:||20.4 knot (38 km/h)|
|Range:||4,200 nautical miles (7,800 km) at 10 knot (19 km/h)|
|Complement:||32 officers, 16 petty-officers, 993 men(1,087 max)|
|Armament:|| 12 × 305 mm guns in triple turrets|
12 × 150 mm guns in single casemates
18 × 70 mm guns in single mountings
4 × 533 mm torpedo tubes
|Armour:||11 inch(280 mm) belt, barbettes, turrets and conning tower; 1.4 inch(48 mm)deck|
Viribus Unitis was built at the Stabilimento Tecnico Triestino yard of Trieste.
After it was clear that Austria-Hungary had lost World War I, the Austrian government decided to give the ship, along with much of the fleet, to the newly-formed State of Slovenes, Croats and Serbs. This move would have avoided handing the fleet to the Allies, since the new state had declared neutrality. However, the now-idle Viribus Unitis and the rest of the former Austro-Hungarian fleet were soon targeted by the Italian Regia Marina. Viribus Unitis was sunk at anchor at Pula by a limpet mine attached by the crew of an Italian mignatta human torpedo on 1 November 1918, three days before the end of the war and only hours after command had been assumed by the new Croatian captain.
The command was given to abandon ship and lacking leadership the crew made no attempt to save the vessel. It capsized in 15 minutes. The captain Janko Vukovic, saluting from the hull, went down with the ship.The ship went down with a Croatian flag. The Italian crew were interned until the end of the war.
Two deactivated shells from the ship's main guns form part of the Faro della Vittoria (Victory Lighthouse) built on a hill above Trieste as a war memorial in the 1920s. This also includes the anchor of the torpedo-boat Audace, the first Italian warship to enter Trieste at the end of World War I.
A meticulously detailed cut-away model of SMS Viribus Unitis, about 6 m long, is on display at the Heeresgeschichtliches Museum in Vienna.
The ships anchor, as well as that of her sister ship (Tegetthoff) can be seen at the entrance to the Naval History Museum in Venice Italy. The museum also has, on display, segments of the mignatta human torpedo used to sink Viribus Unitis.