Illiparambil Corah Chacko (1875–1966) was a geologist, philologist, writer and grammarian of Kerala, India. He was born in Pulinkunnu in Kuttanad in Alappuzha, Kerala. After graduation from Maharajas College in Ernakulam, he went to London, and studied Physics in the Imperial College of Science and Technology, University of London. He became an Associate of the Royal School of Mines. He was the State Geologist of Travancore State and the Director of Industries.