The J. R. R. Tolkien Companion and Guide is a 2006 reference book by the husband and wife team of Christina Scull and Wayne G. Hammond. It provides a detailed chronology of Tolkien's life in volume 1, and a reader's guide in volume 2. The second edition in 2017 revised and extended the work, the reader's guide being divided into two volumes.

The Lord of the Rings: A Reader's Companion (2005) is a nonfiction book by the scholars Wayne G. Hammond and Christina Scull. It is an annotated reference to J. R. R. Tolkien's heroic romance, The Lord of the Rings.