Antonio Fontán Pérez, 1st Marquess of Guadalcanal (15 October 1923 – 14 January 2010) was a Spanish journalist recognized for his work in promoting press freedom in his country.

Fontán's staunch defense of the principles of free expression during those five years as editor earned him and his staff a unique place in the annals of Spanish journalism.

At the time of his death, Fontán was the president and publisher of Nueva Revista de Política, Cultura y Arte, a bimonthly news magazine, which he founded in 1990.

He was the director of a weekly magazine, La Actualidad Española before joining the evening paper, Madrid, in September 1966, shortly after the introduction of a new press law which lifted prior censorship.

Madrid quickly became unpopular with the authorities for its coverage of such taboo subjects as student and labor unrest, the growth of regionalism, illegal trade unionism, and opposition party activities.

Fontán and his paper were bombarded with sanctions for publishing articles defending democracy and civil liberties, and criticizing Francoist Spain.

Finally, in October 1971, the Minister of Information, Sanchez Belle, demanded the replacement of Fontán with a journalist close to the Falange party and the appointment of a director to represent the Ministry.

The paper's editorial staff formed a journalists' association, the first of its kind in Spain, to defend the independence and dignity of the profession and to fight for the retention in office of the present editor.

Calvo Serer, who went into exile in France a few days before the government closed the paper, was tried in absentia and charged with actions "prejudicial to the reputation and authority of the State."

[8] Fontán was the president and publisher of Nueva Revista de Política, Cultura y Arte, a bimonthly magazine on current affairs, which he founded in 1990.