Kaiser is a German title meaning emperor, derived from the Roman title of Caesar.
While Kaiser denoted both the rulers of the Holy Roman Empire (962 - 1806) and of the Austrian and Austro-Hungarian Empire (1806 - 1918), in English usage the title is mainly associated with the emperors of the unified German Empire (1871 - 1918).
The Kaisers of the German Empire were:
- Wilhelm I (1871 - 1888)
- Friedrich III (1888)
- Wilhelm II (1888 - 1918)