El Siglo Futuro was a Spanish Traditionalist/Integrist daily newspaper, published in Madrid between 1875 and 1936.
It was founded by the Carlist politician and thinker Cándido Nocedal; the first issue came out on March 19, 1875. As the Carlists suffered a crushing defeat in the Third Carlist War, the initiative was supposed to shift focus to the long-term perspective of the literary war. The new newspaper was to disseminate the Carlist thought using the highest analytical and erudite standards. Following the death of its founder in 1885, the newspaper was taken over by his son, Ramón Nocedal. In 1889 El Siglo Futuro departed from the mainstream Traditionalism as Nocedal and his followers set up Partido Católico Nacional, a breakaway group usually referred to as the Integrists. After the death of Nocedal in 1907 the newspaper was inherited by his successor at the helm of the group, Juan Olazábal, while Manuel Senante became the editor-in-chief. In 1932, as the Integrists re-united with the mainstream Carlism, the daily followed suit. In 1935 it was fully incorporated into the Carlist propaganda machinery. Following the outbreak of the Civil War it was last issued on July 18, 1936; soon afterwards its premises were ransacked by the anarchists.
The principal objective of El Siglo Futuro remained the defence of Catholic faith and position of the Church in Spain. Ultraconservative, its primary foe was liberalism, later to be paired with - viewed as more radical but somewhat lesser evils - democracy and socialism. The paper propagated the theories of Leo XIII and his successors, advocating a new social and political vision of a modern Catholic state. The daily remained strongly monarchical, though with less clear dynastical allegiances. Disseminated what it perceived traditional Spanish values. In the 20th century the paper led the venomous campaign against the Jews and the freemasonry, claiming that Judaism is the head and the Freemasonry is the arms of the satanic monster; the Jews were alternately accused of alliance with the Russian Bolshevism or with the capitalist . In 1930s El Siglo was a fairly typical Spanish party paper, excelling in bombastic, hyperbolical, inflammatory, intransigent, sectarian phraseology – very much like the republican or socialist press, let alone the anarchist or communist papers. The official Spanish digital archive describes the late daily as fanatically fundamentalist, consumed by apocalyptic obsession and dubbed a caveman.