The Philosophy of Tolkien: The Worldview Behind The Lord of the Rings (ISBN 978-1-58617-025-7) is a scholarly reference book written in 2005 by Peter J. Kreeft, and published by Ignatius Press (San Francisco). The book is a discussion of the philosophical skeleton and hidden worldviews of J.R.R. Tolkien's mythology, mostly of The Lord of the Rings, as gleaned through quotes from Tolkien himself from his letters and through frequently-made inferences from the original text.