Nicholas Leonicus Thomaeus (Niccolò Leonico Tomeo, Νικόλαος Λεόνικος Θωμεύς; 1456–1531) was a Venetian scholar and professor of philosophy as well as of Greek and Latin at the University of Padua.
Thomaeus was born in Venice, Italy on February 1, 1456, to an Albanian or Greek family from Epirus or Albania. While in Florence, he studied Greek philosophy and literature under the tutelage of Demetrios Chalcondyles. In 1497, the University of Padua appointed Thomaeus as its first official lecturer on the Greek text of Aristotle. In 1504, he was elected to succeed Giorgio Valla as chair of Greek in Venice, but because Thomaeus failed to take the post seriously, he was succeeded in 1512 by Marcus Musurus. In 1524, Thomaeus published a collection of philosophical dialogues i