What is the title of the first Discworld novel by Terry Pratchett?

The first Discworld novel by Terry Pratchett is The Colour of Magic.

Published in 1983, The Colour of Magic introduced the Discworld, a flat world carried through space on the backs of four elephants standing on the Great A’Tuin. The novel follows Rincewind, an unwilling and unreliable wizard, and Twoflower, a wealthy tourist from the Agatean Empire.

Their journey brings them into contact with several locations and dangers that establish Discworld’s comic approach to fantasy conventions. The book is more episodic than many later Discworld novels, which often focus on institutions, cities, witches, or the City Watch.

The Light Fantastic is the second Discworld novel and continues directly from the first. Mort is the fourth novel and introduces a major storyline involving Death, while Guards! Guards! begins the City Watch sequence. Although The Colour of Magic starts the series, many readers recommend later books as entry points because Pratchett’s style and world became more developed over time.