(3 July 1883 – 21 January 1954) was an Irish Catholic priest.
Fahey promoted the Catholic social teaching of Christ the King, and was involved in Irish politics through his organisation Maria Duce.
Fahey firmly believed that "the world must conform to Our Divine Lord, not He to it", defending the Mystical Body of Christ without compromise.
This often saw Fahey in conflict with systems which he viewed as promoting "naturalism" against Catholic order – particularly communism, freemasonry and rabbinic Judaism.
He was famous for his opposition to the Jews, writing "every sane thinker must be an anti-Semite".