| Karl Wilhelm Feuerbach | |
| Birth Place: | Jena, Saxe-Weimar, Holy Roman Empire |
| Death Place: | Erlangen, Germany |
| Nationality: | German |
| Field: | Mathematician |
| Work Institution: | University of Basel |
| Alma Mater: | Albert Ludwigs University of Freiburg |
| Known For: | Feuerbach's theorem |
| Footnotes: | Brother of Ludwig Andreas Feuerbach |
Karl Wilhelm Feuerbach (30 May 1800 - 12 March 1834) was a German geometer and the son of legal scholar Paul Johann Anselm Ritter von Feuerbach, and the brother of philosopher Ludwig Feuerbach. After receiving his doctorate at age 22, he became a professor of mathematics at the Gymnasium at Erlangen. In 1822 he wrote a small book on mathematics noted mainly for a theorem on the nine-point circle, which is now known as Feuerbach's theorem. In 1827 he introduced homogeneous coordinates, independently of Möbius.[1]