Walter Eduard Carl Koch (3 May 1880 – 21 November 1962) was a German pathologist best known for the discovery of Koch's triangle, a triangular shaped area in the right atrium of the heart.
Born in Dortmund and educated in Freiburg im Breisgau and at the Kaiser Wilhelm Academy in Berlin, Koch obtained his doctorate in 1907 at Freiburg.
As a military physician, he served at the pathological institute in Freiburg.
After being named a professor in 1922, he worked as head of department at Berlin's Westend hospital.
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