Archibald Lampman was a Canadian poet. "He has been described as 'the Canadian Keats;' and he is perhaps the most outstanding exponent of the Canadian school of nature poets." The Canadian Encyclopedia says that he is "generally considered the finest of Canada's late 19th-century poets in English."

Archibald McKellar MacMechan was a Canadian academic at Dalhousie University and writer. His works deal mainly with Nova Scotia and its history. The Halifax Disaster (Explosion) was an official history of the Halifax Explosion.

Arthur Hammond Marshall, better known by his pen name Archibald Marshall, was an English author, publisher and journalist whose novels were particularly popular in the United States. He published over 50 books and was recognised as a realist in his writing style, and was considered by some as a successor to Anthony Trollope. Educated at Cambridge University, he was later made an honorary Doctor of Letters by Yale University. He travelled widely and made numerous notable acquaintances.

Aristophanes, son of Philippus, of the deme Kydathenaion, was a comic playwright or comedy-writer of ancient Athens and a poet of Old Attic Comedy. Eleven of his forty plays survive virtually complete. These provide the most valuable examples of a genre of comic drama known as Old Comedy and are used to define it, along with fragments from dozens of lost plays by Aristophanes and his contemporaries.

Aristotle was an Ancient Greek philosopher and polymath. His writings cover a broad range of subjects spanning the natural sciences, philosophy, linguistics, economics, politics, psychology and the arts. As the founder of the Peripatetic school of philosophy in the Lyceum in Athens, he began the wider Aristotelian tradition that followed, which set the groundwork for the development of modern science.

Arlo Bates was an American author, educator and newspaperman.

Armando Francisco Bonifacio Palacio y Rodríguez-Valdés was a Spanish novelist and critic.

Enoch Arnold Bennett was an English author, best known as a novelist who wrote prolifically. Between the 1890s and the 1930s he completed 34 novels, seven volumes of short stories, 13 plays, and a daily journal totalling more than a million words. He wrote articles and stories for more than 100 newspapers and periodicals, worked in and briefly ran the Ministry of Information in the First World War, and wrote for the cinema in the 1920s. Sales of his books were substantial and he was the most financially successful British author of his day.

Theodore Arnold Haultain (1857–1941) was a British writer. He was for many years secretary to Goldwin Smith in Toronto, writing a memoir and acting as literary executor after his death. His book, "Hints for Lovers", was a limited edition, dedicated to his daughter Emma.

Arnold Joseph Toynbee was an English historian, a philosopher of history, an author of numerous books and a research professor of international history at the London School of Economics and King's College London. From 1918 to 1950, Toynbee was considered a leading specialist on international affairs; from 1924 to 1954 he was the Director of Studies at Chatham House, in which position he also produced 34 volumes of the Survey of International Affairs, a "bible" for international specialists in Britain.