Unirii Square, Cluj-Napoca in the context of "Matthias Corvinus"

Cluj-Napoca (/ˈkluːʒnæˌpoʊkə/ KLOOZH-na-POH-kə; Romanian: [ˈkluʒ naˈpoka] ), or simply Cluj (Hungarian: Kolozsvár [ˈkoloʒvaːr] , German: Klausenburg), is a city in northwestern Romania. It is the second-most populous city in the country and the seat of Cluj County. Geographically, it is roughly equidistant from Bucharest (445 km; 277 mi), Budapest (461 km; 286 mi) and Belgrade (483 km; 300 mi). Located in the Someșul Mic river valley, the city is considered the unofficial capital of the historical province of Transylvania. For some decades prior to the Austro-Hungarian Compromise of 1867, it was the official capital of the Grand Principality of Transylvania.

As of 2021, 286,598 inhabitants live in the city. The Cluj-Napoca metropolitan area had a population of 411,379 people, while the population of the peri-urban area is approximately 420,000. According to a 2007 estimate, the city hosted an average population of over 20,000 students and other non-residents each year from 2004 to 2007. The city spreads out from St. Michael's Church in Unirii Square, built in the 14th century and named after the Archangel Michael, Cluj's patron saint. The municipality covers an area of 179.52 square kilometres (69.31 sq mi).