The County Hall (Welsh: Neuadd y Sir) is a municipal building located beside the disused Bute East Dock in the Atlantic Wharf area of Butetown, Cardiff.

[4] It is seen as representative of a new form of civic building that does not dominate its surroundings by its size, or formal language, to the extent that it could "even [be] a deliberate abregation of the arrogant assertiveness of the late C19, expressed across the water".

[7] In 2013, the potential sale and demolition of County Hall was again raised, as part of Cardiff Council's plans to reduce their property commitments.

[8] In 2023, the council invited expressions of interest in a mixed-use development of 30 acres (12 ha) in the Atlantic Wharf area, to sit alongside a proposed 17,000-seat arena.

[12] The building also houses the council's Camera Control Room, in which CCTV is used to monitor locations across the city in an attempt to stop fly-tipping and other criminal activity.