Reggio nell'Emilia, usually referred to as Reggio Emilia, or simply Reggio by its inhabitants, and known until 1861 as Reggio di Lombardia, is a city in northern Italy, in the Emilia-Romagna region. It has about 171,944 inhabitants and is the main comune (municipality) of the province of Reggio Emilia.

A comune is an administrative division of Italy, roughly equivalent to a township or municipality. It is the third-level administrative division of Italy, after regions and provinces. The comune can also have the title of città.