Zacharias Papantoniou (Greek: Ζαχαρίας Παπαντωνίου, Zacharias Papadoniou) was a Greek writer. He was born in Karpenissi of Evrytania in February 1877 and died in Athens in 1940. He spent the first years of his life in Granitsa, where his father was a teacher. Apart from a writer, he was also a journalist. Papantoniou's work was basically the first to promote Evrytania. A big part of his work has not been published.