Aarhuus, a seaport of Denmark, in East Jutland, capital of Aarhuus bailiwick, on the Cattegat, 37 m. S.E. of Viborg; pop. in 1870, 15,025. It contains one of the finest and largest cathedrals in Denmark, a library, and a museum. Its commerce is considerable, and it has a regular steam communication with Copenhagen.