Carl Russell Fish was a University of Wisconsin–Madison historian.

Carl August Sandburg was an American poet, biographer, journalist, and editor. He won three Pulitzer Prizes: two for his poetry and one for his biography of Abraham Lincoln. During his lifetime, Sandburg was widely regarded as "a major figure in contemporary literature", especially for volumes of his collected verse, including Chicago Poems (1916), Cornhuskers (1918), and Smoke and Steel (1920). He enjoyed "unrivaled appeal as a poet in his day, perhaps because the breadth of his experiences connected him with so many strands of American life". When he died in 1967, President Lyndon B. Johnson observed that "Carl Sandburg was more than the voice of America, more than the poet of its strength and genius. He was America."

Carl Schurz was a German revolutionary and an American statesman, journalist, and reformer. He migrated to the United States after the German revolutions of 1848–1849 and became a prominent member of the new Republican Party. After serving as a Union general in the American Civil War, he helped found the short-lived Liberal Republican Party and became a prominent advocate of civil service reform. Schurz represented Missouri in the United States Senate and was the 13th United States Secretary of the Interior.

Carl Clinton Van Doren was an American critic and biographer. He was the brother of critic and teacher Mark Van Doren and the uncle of Charles Van Doren.

Carl Van Vechten was an American writer and artistic photographer who was a patron of the Harlem Renaissance and the literary executor of Gertrude Stein. He gained fame as a writer, and notoriety as well, for his 1926 novel Nigger Heaven. In his later years, he took up photography and took many portraits of notable people. Although he was married to women for most of his adult years, Van Vechten engaged in numerous homosexual affairs over his lifetime.

Carl William Ackerman was an American journalist, author and educational administrator, the first dean of the Columbia School of Journalism. In 1919, as a correspondent of the Public Ledger of Philadelphia, he published the first excerpts of an English translation of The Protocols of the Elders of Zion but changed the text so that it appeared to be a Bolshevik tract.

Carlo Lorenzini, better known by the pen name Carlo Collodi, was an Italian author, humourist, and journalist, widely known for his fairy tale novel The Adventures of Pinocchio.

Carlo Osvaldo Goldoni was an Italian playwright and librettist from the Republic of Venice. His works include some of Italy's most famous and best-loved plays. Audiences have admired the plays of Goldoni for their ingenious mix of wit and honesty. His plays offered his contemporaries images of themselves, often dramatizing the lives, values, and conflicts of the emerging middle classes. Though he wrote in French and Italian, his plays make rich use of the Venetian language, regional vernacular, and colloquialisms. Goldoni also wrote under the pen name and title Polisseno Fegeio, Pastor Arcade, which he claimed in his memoirs the "Arcadians of Rome" bestowed on him.

Carlo, Count Gozzi was an Italian (Venetian) playwright and champion of Commedia dell'arte.

Caroline Abbot Stanley was an American author. Her best known book was the Civil War novel Order No. 11 (1904), which was a regional best seller.