Julius Koch (b. 1872 in Reutlingen, Germany - d. 1902 in Mons, Belgium), also known as Le Geant Constantin, was one of eleven people in medical history who have surpassed eight feet in height. He was a victim of the malady eunuchoidal-infantile giantism (daddy-longlegs syndrome). His height, 245.9 centimeters, (8 feet 0.8 inches) was estimated, as his legs were amputated after they developed gangrene. His femurs were the longest on record - 76 centimeters (29.9 inches) - and his hands were 37½ centimeters (14¾ inches) in length.

Koch died in Mons, Belgium on March 30, 1902. His skeleton is preserved in the Museum of Natural History in Mons.