Lucy Ellen Guernsey was a 19th-century American author who lived in Rochester, New York. She was a strong proponent of early education and moral development in children, although she never had children of her own. Throughout her most productive years (1855–85) she wrote over 60 novels, most of which were published by the American Sunday School Union. She was an active member of the Rochester community; she founded the first sewing school for working-class children and was involved establishing the Home for Aged Women. She edited a popular religious publication, The Parish Visitor, taught an adult biblical class for Sunday School, and was the president of the Christ Church Missionary Society (1881–85).

Lucy Fitch Perkins was an American illustrator and writer of children's books, known best for Dutch Twins (1911) and its sequels, the Twins series.

Lucy Foster Madison was an American novelist and teacher.

Lucy Maud Montgomery, published as L. M. Montgomery, was a Canadian author best known for a collection of novels, essays, short stories, and poetry beginning in 1908 with Anne of Green Gables. She published 20 novels as well as 530 short stories, 500 poems, and 30 essays. Anne of Green Gables was an immediate success; the title character, orphan Anne Shirley, made Montgomery famous in her lifetime and gave her an international following. Most of the novels were set on Prince Edward Island, and those locations within Canada's smallest province became a literary landmark and popular tourist site – namely Green Gables farm, the genesis of Prince Edward Island National Park. She was made an officer of the Order of the British Empire in 1935.

Lucy Maynard Salmon was an American historian. She was a professor of history at Vassar College from 1889 until her death. She was the first woman to be a member of the executive committee of the American Historical Association. She published widely in historical journals and general magazines, and was highly active in civic affairs, supporting civil service reform and world and women suffrage.

Ludovic Halévy was a French author and playwright, best known for his collaborations with Henri Meilhac on Georges Bizet's Carmen and on the works of Jacques Offenbach.

Ludovico Maria Sinistrari was an Italian Franciscan priest and author.

Ludvig Holberg, Baron of Holberg was a writer, essayist, philosopher, historian and playwright born in Bergen, Norway, during the time of the Dano-Norwegian dual monarchy. He was influenced by Humanism, the Enlightenment and the Baroque. Holberg is considered the founder of modern Danish and Norwegian literature. He was also a prominent Neo-Latin author, known across Europe for his writing. He is best known for the comedies he wrote in 1722–1723 for the Lille Grønnegade Theatre in Copenhagen. Holberg's works about natural and common law were widely read by many Danish law students over two hundred years, from 1736 to 1936.

Ludwig Andreas von Feuerbach was a German anthropologist and philosopher, best known for his book The Essence of Christianity, which provided a critique of Christianity that strongly influenced generations of later thinkers, including Charles Darwin, Karl Marx, Sigmund Freud, Friedrich Engels, Richard Wagner, and Friedrich Nietzsche.

Ludwig Thoma was a German author, publisher and editor, who gained popularity through his partially exaggerated description of everyday Bavarian life.