Bergenhus is a borough of the city of Bergen in Hordaland county, Norway. This borough encompasses the city centre and is the most urbanized area of the whole city. The 25.41-square-kilometre (6,280-acre) borough has a population (2014) of 40,606. This gives Bergenhus a population density of 1,598 inhabitants per square kilometre (4,140/sq mi).

Named after the historic Bergenhus Fortress, Bergenhus makes up the city centre and the neighborhoods immediately surrounding it, including Sandviken and Kalfaret, as well as the mountains to the north and east of the city centre. It stretches from Haukeland University Hospital in the south to Lønborg in the north, and covers the entire mountain side and the peninsula bounded by the bay of Store Lungegårdsvannet, Puddefjorden and Byfjorden that forms the city's center. Bergenhus is surrounded by the neighborhoods Åsane in the north, Arna in the east, Årstad to the south, Laksevåg to the west and by Askøy to the northwest.

The borough of Bergenhus includes the neighborhoods of Bryggen, Ladegården, Kalfaret, Møhlenpris, Nordnes, Sandviken, Solheimsviken, Sydnes, and Verftet. It is the site of some of the most historic buildings in Bergen including Bergenhus Fortress with Haakon's Hall and Rosenkrantz Tower. It is also the location of the University of Bergen, Bergen Cathedral, Mariakirken, and the Korskirken.

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