Avilés is a town in Asturias, Spain. Avilés is with Oviedo and Gijón, one of the main cities in the Principality of Asturias.

The town occupies the flattest land in the municipality, in a land that belonged to the sea, surrounded by small promontories, all of them having an altitude of less than 140 metres. Situated in the Avilés estuary, in the Northern Central area of the Asturian coast, west of Peñas Cape, is its national seaport.

Avilés is mainly an industrial city. It is close to popular beaches like Salinas. It also has important churches like St. Thomas of Canterbury. Avilés has the Oscar Niemeyer International Cultural Centre (in Spanish: Centro Cultural Internacional Oscar Niemeyer).

Sights include:

• St. Thomas of Canterbury church (dating from the 13th century)
• Church of Saint Nicholas of Bari (12th-13th century), in Romanesque style
• Palacio de Valdecarzana, the sole example of civil medieval architecture in the town
• Palacio de Llano Ponte (1700-1706)
• Baroque Palacio de Camposagrado, fortified in its north façade against the English pirates
• Capilla de los Alas, a 14th-century funerary monument in Romanesque-Gothic transition style
• Old church of Sabugo (13th century)
• Palacio de Balsera, in Modernist style
• Palacio Valdés Theatre, in Neobaroque style.
• Museum of Avilés Urban History
• Black Pottery Museum
• Alfercam Museum, where visitors can find a combination of world musical instrumentas and vintage cars.
• "Casa de Cultura", including the Bances Candamo public library, art gallery, reading and study areas.
• CMAE - Centro municipal de arte y exposiciones - arts and exhibicion centre in El Arbolón area, not far from the town centre.
• Oscar Niemeyer International Cultural Centre, designed by the Brazilian architect Oscar Niemeyer. It is a magnet for different personalities, including winners of the Prince of Asturias Awards, the Nobel prize, musicians, actors, the United Nations, etc.