Iron John: A Book About Men is a book by American poet Robert Bly, and an exegesis of Iron John, a parable belonging to the Grimms' Fairy Tales (1812) by German folklorists Brothers Grimm about a boy maturing into adulthood with help of the wild man.

Robert Elwood Bly was an American poet, essayist, activist and leader of the mythopoetic men's movement. His best-known prose book is Iron John: A Book About Men (1990), which spent 62 weeks on The New York Times Best Seller list, and is a key text of the mythopoetic men's movement. He won the 1968 National Book Award for Poetry for his book The Light Around the Body.