Kaiser is a German title meaning emperor, derived from the Roman title of Caesar, as is the Russian title of Czar.

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)

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Kaiser was also the name of an automobile trademark, named for the man who started the company, Henry J. Kaiser: see Kaiser (automobile)

Kaiser Permanente is a health maintenance organization (HMO), also started by Henry J. Kaiser.

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