Nestor Karlovich Genko (or Henko, Russian: Нестор Карлович Генко) January 22 (February 3) 1839 in the Grodno Governorate, province of Kurland, Russian Empire – January, 28 (February 10) 1904 in Menton, France), was a scientist in the field of forestry, known for creation of the world's first major watershed protection forest belt system, the Genko Forest Belt, located in the east of Ulyanovsk Oblast. He was also a hero of the Russo-Turkish War of 1877–78.