Which Tolkien novel was published in three volumes from 1954 to 1955?

The Tolkien novel published in three volumes from 1954 to 1955 is The Lord of the Rings.

The work was published as The Fellowship of the Ring in 1954, followed by The Two Towers later that year and The Return of the King in 1955. Although it is commonly called a trilogy, Tolkien regarded it as one novel divided into volumes for publication rather than three independent novels.

The story follows the attempt to destroy the One Ring, the instrument through which Sauron seeks dominion over Middle-earth. Its principal settings include the Shire, Rivendell, Moria, Rohan, Gondor and Mordor. The narrative combines several groups of characters after the Fellowship breaks apart.

The Hobbit is the earlier novel about Bilbo’s adventure, while The Silmarillion presents myths and histories from Tolkien’s larger legendarium. Unfinished Tales is a posthumous collection of narratives and notes, not the three-volume novel.

The book’s publication established Tolkien as a major modern fantasy author and strongly influenced later fantasy literature.