Ivan Feodosiyovych Korsak (; 15 September 1946 – 7 December 2017) was a Ukrainian writer and journalist. He was best known as chief editor of the newspaper "Simya i Dim". He was also worked at newspapers such as "Radyans'ke Polissya", "Narodna trybuna" and "Literary Ukraine". He was born in Zabolottya, Volyn Oblast.