Buskerud County Municipality (Norwegian: Buskerud fylkeskommune) was the regional governing administration of the old Buskerud county in Norway. The county municipality was established in its most recent form on 1 January 1976 when the law was changed to allow elected county councils in Norway. The county municipality was dissolved on 1 January 2020, when Buskerud was merged with the neighboring counties of Akershus and Østfold, creating the new Viken county which is led by the Viken County Municipality. The administrative seat is located in Drammen and the county mayor was Roger Ryberg.