Noreña is a municipality located within the Autonomous Community of the Principality of Asturias in Spain. It is entirely surrounded by the neighboring municipality of Siero.
The municipality is notable for its size and demographics, ranking as the smallest municipality in Asturias and the second smallest in all of Spain. Despite its small geographic footprint, it is characterized by a high population density and one of the highest per capita incomes in the region.
Noreña also serves as the name of the municipal capital and a specific parish within the municipality.