Sussex Street is a street in the central business district of Sydney in New South Wales, Australia. It runs north-south along the western side of the city, between Hickson Road and Hay Street. It is in the local government area of the City of Sydney. The street is 1.7 kilometres (1.1 mi) long. It was named in honour of Prince Augustus Frederick, Duke of Sussex, the sixth son of King George III.

The Corn Exchange is a heritage-listed former market building located at 173–185 Sussex Street, in the Sydney central business district, in the City of Sydney local government area of New South Wales, Australia. It was designed by George McRae and built from 1887. It formerly housed PACT Youth Theatre. It was incorporated into the Nikko Hotel development in the 1980s, but has been commercial office space since the 1990s. It was added to the New South Wales State Heritage Register on 28 June 2002.