Aarhus or Århus (Danish pronunciation: [ˈɒːhuːˀs] ( listen)) is the second-largest city in Denmark. The principal port of Denmark, Aarhus is on the east side of the peninsula of Jutland in the geographical center of Denmark. Aarhus is the seat of the council of Aarhus municipality with 311,235 inhabitants and 249,709 (1 January 2011) in the inner urban area. According to Aarhus municipality, the "Greater Aarhus" area has a population of about 1.2 million people. The city claims the unofficial title "Capital of Jutland".

Aarhus is the main and biggest city in the East Jutland metropolitan area (Danish: Byregion Østjylland), which is a co-operation in eastern Jutland with 17 municipalities. With more than 1.2 million people living in the East Jutland metropolitan area it represents approximately 23% of the population of Denmark. Aarhus has the second-largest urban area in Denmark after Copenhagen.