Westpac Banking Corporation, known simply as Westpac, is an Australian multinational banking and financial services company headquartered at Westpac Place in Sydney.

The Bank of New South Wales (BNSW), also known commonly as The Wales, was the first bank in Australia, being established in Sydney in 1817 and situated on Broadway. During the 19th century, the bank opened branches throughout Australia and New Zealand, expanding into Oceania in the 20th century. It merged with many other financial institutions, finally merging with the Commercial Bank of Australia in 1982 and being renamed to the Westpac Banking Corporation on 4 May that year under the Bank of New South Wales Act 1982.