Louis Sachar is an American young-adult mystery-comedy author. He is best known for the Wayside School series and the novel Holes.

Louis Aston Marantz Simpson was an American poet born in Jamaica. He won the 1964 Pulitzer Prize for Poetry for his work At the End of the Open Road.

Louis Stanislas de Girardin was a French general, prefect, and deputy, who was close to Joseph-Napoléon Bonaparte.

Louis Tiercelin, was a French writer, poet and playwright associated with the Breton cultural renaissance of the early 20th century.

Louis Tracy (1863–1928) was a British journalist, and prolific writer of fiction. He used the pseudonyms Gordon Holmes and Robert Fraser, which were at times shared with M. P. Shiel, a collaborator from the start of the twentieth century.

Louis Preston Trimble was an American writer and academic. His published work included science fiction, westerns, mysteries, and academic non-fiction. He generally wrote as Louis Trimble, but used the pseudonym "Stuart Brock" for some of his work.

Louis Ulbach was a French novelist, essayist and journalist. He published seventy-six volumes, wrote three plays, and wrote numerous articles and political or biographical pamphlets. His romantic novels were compared to the works of Émile Zola and Alphonse Daudet.

Louis Untermeyer was an American poet, anthologist, critic, and editor. He was appointed the fourteenth Consultant in Poetry to the Library of Congress in 1961.

Louis Viardot was a French writer, art historian, art critic, theatrical figure, and translator. As a translator, he mostly contributed to the development of Russian and Spanish literature in France. He was the older brother of the artist Léon Viardot (1805–1900).

Louis Vulliemin was a Swiss theologian and historian.