Marco Denevi (May 12, 1922 – December 12, 1998) was an Argentine author of novels, short stories, and plays, as well as a lawyer and journalist.

His first work, a mystery novel titled Rosaura a las diez (1955), was a Kraft award winner and a [citation needed] bestseller.

Ceremonia Secreta was filmed as Secret Ceremony in 1968 starring Elizabeth Taylor, Mia Farrow, Robert Mitchum, and Peggy Ashcroft.

He is less known as an essayist, but he also cultivated that genre with his República de Trapalanda (1989), a late work, where he took on Ezequiel Martínez Estrada and Domingo Faustino Sarmiento's view of the Argentine republic.

He was born in the province of Buenos Aires, Argentina, and at a young age he began playing the piano and reading.