What name is given to the book that records the history of the Shire in J.R.R. Tolkien’s fiction?

The book that records the history of the Shire in J.R.R. Tolkien’s fiction is The Red Book of Westmarch.

Within the fictional history, Bilbo Baggins begins the record after his journey, and Frodo Baggins continues it with an account of the War of the Ring. Samwise Gamgee later adds to the manuscript and preserves it for his family.

The Red Book is presented as a source behind parts of The Hobbit and The Lord of the Rings. This framing device lets Tolkien make the narratives resemble translations and inherited historical records rather than ordinary modern novels.

The name is sometimes confused with the Book of Mazarbul, a separate record found in Moria, or with Tolkien’s real-world Red Book references. The Westmarch book is associated with Hobbit historians and later copies in Gondor, including a version connected with King Elessar’s scholarly work.