Mario Octavio Amadeo French (11 January 1911 – 19 March 1983[1]) was an Argentine conservative nationalist politician, diplomat and writer who served as a minister in the government of Eduardo Lonardi.

[1] During the 1930s the youthful Amadeo was closely associated with the anti-liberalism tendency and took his inspiration from such Catholic conservative writers as Léon Bloy, Charles Péguy, Jacques Maritain, G. K. Chesterton, Hilaire Belloc, Giovanni Papini and Ramiro de Maeztu.

[2] As such he belonged to the group of rightist authors and activists that included Carlos Ibarguren, Manuel Gálvez, Juan Carulla, Ernesto Palacio, Máximo Etchecopar and Rodolfo and Julio Irazusta.

He was also the President of Ateneo de la República, an elitist semi-secret club active in the 1940s and accused of fascism by its opponents, which included a number of cabinet ministers amongst its members.

[7] Within General Lonardi's cabinet, he was part of a Catholic nationalist strain that recalled the earlier ideas of the likes Carulla and the Irazustas and also included Labour Minister Luis Cerruti Costa and the President's brother in law Clemente Villada Achaval.