Jakob Merten (August 11, 1809 – February 22, 1872) was a German Catholic theologian born in Wittlich. He studied theology in Trier, where in 1833 he received his ordination. Subsequently, he became a chaplain in Trier, where he worked closely with Franz Peter Knoodt (1811–1889). From 1843 to 1868 he was a professor of philosophy at the Episcopal Seminary in Trier. * Grundriss der Metaphysik, (Outline of metaphysics); 1848. * Der selige Frings und sein Freund als Antigüntherianer; 1852. * Bemerkungen zur Metaphysik von Balmes, (Remarks on the metaphysics of Balmes); 1859.