The World of Tolkien: Seven-Book Boxed Set is a comprehensive reference collection by bestselling Tolkien scholar David Day, presenting four decades of research on the lands and inhabitants of J.R.R. Tolkien's Middle-earth. The set includes seven leather-bound hardcover books housed in a decorative purple boxed container measuring 6 × 6 × 8 inches, making it an ideal gift for fans of Middle-earth.

The seven volumes in this collection cover every corner of Tolkien's legendary world: An Atlas of Tolkien maps the various terra firma of Middle-earth; The Battles of Tolkien details the great conflicts across the ages; The Dark Powers of Tolkien explores the forces of evil from Morgoth to Sauron; A Dictionary of Tolkien provides an A-to-Z guide to the vernacular, characters, and places; The Heroes of Tolkien celebrates the brave figures who shaped Middle-earth's destiny; The Hobbits of Tolkien spotlights the small folk who changed everything; and The Ring Legends of Tolkien chronicles the history and lore of the Rings of Power.

Together the set spans 1,792 pages and features more than 200 black-and-white and full-color illustrations. Published by Thunder Bay Press (ISBN 978-1-64517-824-8, November 2023). David Day is the author of over a dozen books on Tolkien's world, with works translated into twenty languages and over 3 million copies sold. This work is unofficial and is not authorized by the Tolkien Estate or HarperCollins Publishers.