Leonard C. Lewin was an American writer, best known as the author of the bestseller The Report from Iron Mountain (1967). He also wrote Triage (1972), a novel about a covert group dedicated to killing people it considers to be not worth having around.
Lewin graduated from Harvard University. Before becoming a writer, he worked as a labor organizer in New England and in his father's sugar refinery in Indianapolis, Indiana. He was twice married: first to Iris Zinn Lewin and later to poet, playwright and children's book author Eve Merriam. Both marriages ended in divorce. Later, his "longtime companion" was Lorraine Davis.