Akershus ([ˈɑ̂ːkəʂˌhʉːs]) is a traditional region and current electoral district in Norway, with Oslo as its main city and traditional capital. It is named after the Akershus Fortress in Oslo. From the middle ages to 1919, Akershus was a fief and main county that included most of Eastern Norway, and from the 17th century until 2020, Akershus also had a more narrow meaning as a (sub) county that included most of the Greater Oslo Region. After 2020 the former county of Akershus was merged into Viken along with the former counties of Østfold and Buskerud. In 2022 the Storting voted to dissolve Viken and reestablish Akershus county.