Karl Oskar Medin (August 14 1847December 24 1928) was a Swedish paediatrician. He was born on Axberg, Örebro and died in Stockholm. He is most famous for his study of poliomyelitis, an illness often known as the Heine-Medin disease, named after Medin and another physician, Jakob Heine. He has also influenced the study of meningitis and tuberculosis.

Medin received his doctorate in 1880 from the University of Uppsala. He was appointed extraordinary professor at the Karolinska Institute in 1883 and went on to become professor of paediatrics the following year. He became professor emeritus in 1914.

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