John de Lugo (also Juan de Lugo y de Quiroga) (1583–1660), a Spanish Jesuit and Cardinal, was an eminent theologian of the Renaissance.
He was born in November, 1583 in Madrid, though he used to call himself a "Hispalensis", because his family seat was at Seville. Both his father (also named Juan de Lugo) and his mother (Teresa de Quiroga, whose family name he bore for a time as was custom for the second son) were of noble birth.
At the age of three years he could read printed or written books; at ten, he received the tonsure; at fourteen he defended a public thesis in logic and at about the same time was appointed by King Philip II of Spain to an ecclesiastical benefice which he retained until he became a priest in 1618.
Like his elder brother, Francis, he was sent by his father to the University of Salamanca to study law. But Francis entered the Society of Jesus where he became a distinguished theologian and John soon desired to follow his brother. He twice asked his father for permission to join the order but, having failed to receive it, joined in any case in 1603.
After completing his studies he was appointed professor of philosophy at Medina del Campo in 1611 and later professor of theology at Valladolid where he taught for five years. His fame as a professor of theology attracted the attention of the General of the Jesuits, Muzio Vitelleschi and de Lugo was summoned to Rome where he arrived early in June 1621.