M. K. Sanu (born 27 October 1928) is a Malayali writer, critic, retired professor, biographer, journalist, orator, social activist, and human rights activist. He has authored over thirty-six books. He is a permanent member of the International Body for Human Rights, as well as the founding member of the Mithram, a school for the mentally handicapped, in Mulanthuruthy, Ernakulam District, Kerala. He was a member of the award selection committee of the Vayalar Rama Varma Literary Award; however, he resigned in September 2019. In 2011, he won the Padmaprabha Literary Award.