Cynthia Stockley was a South African novelist known for her romance novels usually set in Rhodesia and South Africa. Her name before her marriage was Lilian Julian Webb. Cynthia was an adopted name.

Savinien de Cyrano de Bergerac was a French novelist, playwright, epistolarian, and duelist.

Cyril Bentham Falls CBE was a 20th Century British military historian, journalist, and academic, noted for his works on the First World War.

Cyril M. Kornbluth was an American science fiction author and a member of the Futurians. He used a variety of pen-names, including Cecil Corwin, S. D. Gottesman, Edward J. Bellin, Kenneth Falconer, Walter C. Davies, Simon Eisner, Jordan Park, Arthur Cooke, Paul Dennis Lavond, and Scott Mariner.

Cyrus Townsend Brady was a journalist, historian and adventure writer. His best-known work is Indian Fights and Fighters.