Madis Kõiv (5 December 1929 – 24 September 2014) was an Estonian writer and physicist. His first published work was a play called "Küüni täitmine" ("Filling the Hay Barn"). Kõiv was also the author of several novels. "Widow" and "Aporia of Attica, Tragedy of Elea" are two of his best known works. He was born in Tartu, Estonia.