Luesia is a municipality in the province of Zaragoza, in the Aragon region of northeastern Spain. It is located in the comarca of Cinco Villas, in the foothills of the Pyrenees, roughly 100 kilometres north of the city of Zaragoza.
The municipality is small and sparsely populated, with a recorded population of 384 inhabitants in the 2004 census. Its historic centre preserves a medieval layout, including the remains of a castle and several Romanesque churches, most notably the Church of San Salvador.