Hay Street is a major road through the central business district of Perth, Western Australia and adjacent suburbs. The street was named after Robert William Hay, the Permanent Under Secretary for Colonies. Sections of the road were called Howick Street and Twiss Street until 1897. One block in the central business section is now a pedestrian mall with extremely limited vehicular traffic, so that it is necessary to make a significant detour in order to drive the entire length of Hay Street.

Perth is the capital city of Western Australia. It is the fourth most populous city in Australia, with a population of over 2.3 million within Greater Perth. It is part of the South West Land Division of Western Australia, with the majority of Perth's metropolitan area on the Swan Coastal Plain between the Indian Ocean and the Darling Scarp. The city has expanded outward from the original British settlements on the Swan River, upon which its central business district and port of Fremantle are situated.