Casimir I the Restorer (1016–1058) was a Polish politician. He was born in Kraków on 25 July 1016. He died in Poznań on 19 March 1058, at the age of 42.
The public offices recorded are Duke of Poland (1034–1058).
Casimir I the Restorer was the son of Mieszko II and Richeza of Lotharingia. He married Maria Dobroniega of Kiev. He had four recorded children, Bolesław II the Generous, Władysław I Herman, Mieszko Kazimierzowic and Świętosława of Poland.
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