Welsh Romanticism in its broadest sense can be taken to encompass a set of interconnected ideas which emerge from the study of a wide range of texts, images, and practices produced in the late 18th and early 19th centuries, within Wales or by Welsh-born authors living elsewhere, but also by writers from outside Wales who engaged in significant ways with Wales or Welsh culture. This article aims to show how the notion of Welsh Romanticism, like that of Romanticism more generally, has altered over the last 50 years, expanding its areas of interest and embracing greater generic, cultural, and linguistic diversity. It locates Wales within some of the key movements of Romantic-era Europe, including responses to the French Revolution, cultural nationalism, antiquarianism, and the aesthetic appreciation of landscape.