Karl Theodor Otto Christian August Bayrhoffer (14 October 1812, in Marburg – 3 February 1888) was a German American philosopher, free-thinker, and publicist.
In 1834 he received his PhD from the University of Marburg, where he later became a professor of philosophy. In 1847 he founded the free-religious movement in Marburg. He became a member of the Diet of Hesse-Kassel (or Hesse-Cassel) in 1848 and in 1850 was President of the Chamber. After impeachment and the defeat of his party, he was imprisoned for a time before emigrating to the United States. and settling in Wisconsin as a farmer. When his sons became old enough to manage the farm, he returned to his writing.
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