Jacobus Latomus (or Jacques Masson) (c. 1475 – 29 May 1544)[2][3] was a Catholic Flemish theologian, a distinguished member of the Faculty of Theology at the University of Leuven.

The general focus of his academic work centered on opposing Martin Luther and the Protestant Reformation, supporting the papacy and the hierarchy of the Catholic Church.

Other writings included criticism of Martin Luther, a defense of the theologians of Leuven, and arguments against Johannes Oecolampadius and Philipp Melanchthon.

[1] Nicholas Crane has described Latomus as a "tiny, chilling, man with thin lips, dark, bagged eyes and a limp".

Latomus's replies, along with his first letter, were collected by his nephew into a work called Refutations against Tyndale (1550), which included an introduction by Livinus Crucius, the parish priest of the Flemish village of Boeschepe.