Prince Alfred Square is a 1.5-hectare (3.7-acre) park on the northern side of the Parramatta River in the central business district of Parramatta. It is one of the oldest public parks in New South Wales and is listed on the New South Wales State Heritage Register. St Patrick's Cathedral is located directly opposite the square to the west. It was added to the New South Wales State Heritage Register on 28 August 2017.