Wilhelm Leichum (May 12, 1911, Neu-Isenburg, Grand Duchy of Hesse – July 19, 1941, Gorky) was a German athlete who competed mainly in the long jump and 100 metres.
Leichum was born in Hesse. He competed for Germany in the 1936 Summer Olympics held in Berlin, Germany in the 4 x 100 metre relay where he won the bronze medal with his team mates Erich Borchmeyer, Erwin Gillmeister and Gerd Hornberger. He was also 4th in the long jump. He was European Champion in the long jump both in 1934 and 1938.
Leichum was killed near Gorky during fighting on the Eastern Front of World War II.