Portrait of Jennie is a novel by American writer Robert Nathan, first published in 1940. This story combines romance, fantasy, mystery, and the supernatural. The most successful of Nathan's books, it is considered a modern masterpiece of fantasy fiction. Judith Merril called Portrait of Jennie "one of the most durable successes in the fantasy business," and Ray Bradbury wrote of the book, "It touched and frightened me when I was twenty-four. Now, once more, it touches and frightens."