SMS Baden was a Bayern-class dreadnought battleship of the German Imperial Navy built during World War I. Launched in October 1915 and completed in March 1917, she was the last battleship completed for use in the war; two of her sisters—Sachsen and Württemberg—were incomplete when the war ended. The ship mounted eight 38-centimeter (15 in) guns in four twin turrets, displaced 32,200 metric tons (31,700 long tons; 35,500 short tons) at full combat load, and had a top speed of 21 knots (39 km/h; 24 mph). Along with her sister Bayern, Baden was the largest and most powerfully armed battleship built by the Imperial Navy.
Upon commissioning into the High Seas Fleet, Baden was made the fleet flagship, replacing Friedrich der Grosse. Baden saw little action during her short career; the only major sortie in April 1918 ended without any combat. Following the German collapse in November 1918, Baden was interned with the majority of the High Seas Fleet in Scapa Flow by the British Royal Navy. On 21 June 1919, Rear Admiral Ludwig von Reuter ordered the scuttling of the fleet. However, British sailors in the harbor managed to board Baden and beach her to prevent her sinking. The ship was refloated, thoroughly examined, and eventually sunk in extensive gunnery testing by the Royal Navy in 1921.
SMS Baden was one of four Sachsen-class armored frigates of the German Imperial Navy. Her sister ships were Sachsen, Bayern, and Württemberg. Baden was built in the Imperial Dockyard in Kiel from 1876 to 1883. The ship was commissioned into the Imperial Navy in September 1883. She was armed with a main battery of six 26 cm (10 in) guns in two open barbettes.
After her commissioning, Baden served with the fleet on numerous training exercises and cruises in the 1880s and 1890s, during which she frequently simulated hostile naval forces. She participated in several cruises escorting Kaiser Wilhelm II on state visits to Great Britain and to various countries in the Baltic Sea in the late 1880s and early 1890s. During 1896–1897, the ship was extensively rebuilt at the Germaniawerft dockyard in Kiel. She was removed from active duty in 1910 and thereafter served in a number of secondary roles, finally serving as a target hulk in the 1920s and 1930s. She was sold in April 1938 and broken up in 1939–1940 in Kiel.