Friedrich Johann Graf von Medem (29 August 1912 in Remten, Germany - 1 May 1984 in Bogotá, Colombia) was a German-born zoologist who emigrated to Colombia at age 38 (in 1950) and later became a representative of the IUCN Crocodiles Specialist Group for South America.
He was also known as Federico Medem and published under this name.