SMS Kaiser has been the name of two ships of the German Imperial Navy:
SMS Kaiser (1874), a Kaiser-class ironclad
SMS Kaiser (1911), a Kaiser-class battleship which served through World War I
SMS Kaiser (1905), a fleet auxiliary converted into a minelayer during World War I
Additionally, a number of Imperial Navy vessels were given names of specific kaisers:
SMS Kaiser Barbarossa, an 11,600-ton Kaiser Friedrich III-class battleship, launched 1900
SMS Kaiser Friedrich III, an 11,600-ton Kaiser Friedrich III-class battleship, launched 1896
SMS Kaiser Karl der Grosse, an 11,600-ton Kaiser Friedrich III-class battleship, launched 1899
SMS Kaiser Wilhelm II, an 11,600-ton Kaiser Friedrich III-class battleship, launched 1897
SMS Kaiser Wilhelm der Grosse, an 11,600-ton Kaiser Friedrich III-class battleship, launched 1899
Two ships have been named Kaiserin:
SMS Kaiserin, a 25,000-ton Kaiser-class battleship, launched 1911
SMS Kaiserin Augusta: 6,000-ton unique heavy cruiser, launched 1892
SMS Kaiser was the name of a ship of the Austro-Hungarian Navy:
SMS Kaiser (1858), the last wooden ship of the line of the Austro-Hungarian Navy.
