Trenčín (German: Trentschin; Hungarian: Trencsén; Latin: Laugaritio) is a town in western Slovakia (close to the Czech border) on the Váh river.
The site is inhabited since time immemorial. Trenčín is best known for Roman writing below the Trenčín castle. In the 13th century, the castle was home to the legendary Matthew Csák, "Lord of the river Váh and the Tatra mountains".