The Glamorgan Building (Welsh: Adeilad Morgannwg) is a former county hall located at King Edward VII Avenue in Cathays Park, Cardiff, Wales.

[3] After finding this arrangement inadequate, county leaders decided to procure a purpose-built facility: the site they selected at Cathays Park was acquired from the Marquess of Bute in 1898.

[8] The design involved a symmetrical main frontage of seven bays facing King Edward VII Avenue; the central section of five bays featured a large portico with a deeply recessed entrance flanked by a series of pared Corinthian order columns.

[1] Serving as reminders of Glamorgan's source of wealth, two groups of statues by Albert Hodge, one representing navigation and the other coal mining, were unveiled outside the building.

It was built to the south west of the main building to a design by Ivor Jones and Percy Thomas at a cost of £54,054[6] and opened on 22 September 1932.