Roald Dahl Plass is a public space in Cardiff Bay, Cardiff, Wales. It is named after Cardiff-born author Roald Dahl, and is located on the coast along the south of the city centre. The square is home to the Senedd (Welsh Assembly Building) and the Wales Millennium Centre, a performing arts centre. The bowl-like shape of the space has made it a popular amphitheatre for hosting open-air concerts.
Formerly named the Oval Basin or the Bowl to locals, the area was one of the docks for a thriving coal port during the latter half the 19th century and much of the 20th century. Following World War II, the space entered a period of decay and dereliction until the 1980s, when the Cardiff Bay area was regenerated.
The name is a nod to the acclaimed writer's roots (both of Dahl's parents were from Norway) and to the Norwegian seafarers' church which stands nearby. "Plass" is the Norwegian cognate of the English word "place;" in this context the word means square in Norwegian, although the word can also mean "space" or "place." However in Norwegian the name of a square named after a person would correctly be written in the genitive case, in this case as "Roald Dahls plass" (literally, "Roald Dahl's square"). The word "plass" is not capitalized in modern (post-1907) Norwegian.
The area was originally all wetlands owned by John Crichton-Stuart, 2nd Marquess of Bute. He was persuaded to finance construction of the dock on his land at a cost of over £ 350,000. The dock opened under the name "West Bute Dock" on 8 October 1839, and was over 1400 yards (1280 m) long and 200 feet (60 m) wide, allowing 300 vessels to berth at any time.