There are many lenders in the Australian mortgage market. Most of them are regulated as banks, and all of them must follow the National Credit Code.
The Big Four banks. The Big Four are the dominant players across Australian banking. Most customers stick with Commonwealth Bank, NAB, Westpac or ANZ. They all offer banking apps, large customer service teams, extensive branch and ATM coverage, and lots of mortgages to choose from. You won't get the absolute lowest rates with the Big Four, but they are always competitive.
Other banks. There's more to mortgages than the biggest players, of course. There are state and regional banks as well as nationwide operators and local arms of international banks like ING and Citibank.
Credit unions and non-bank lenders. There is an enormous number of Australian credit unions, non-bank lenders, building societies and other institutions that are member-owned. This means they work for their members and don't pay dividends to shareholders.
Digital banks, fintechs, neo-banks and online lenders. There are lenders that do business entirely online (with phone support). Lenders such as loans.com.au, Tiimely Home and UBank are examples of online lenders with competitive rates. Some newer players in the market include neobank or fintech lenders like Athena and 86 400, which use apps and big data to offer customers a convenient online mortgage experience.