When playing real money online casinos in Australia, the most commonly accepted currencies are the Australian dollar (AUD), the US dollar (USD), and the Euro (EUR). However, most online casinos also accept other currencies such as the Canadian dollar (CAD), the British pound (GBP), and the Japanese yen (JPY). It's important to note that not all real money online casinos accept all currencies, so it's always best to check with the casino reviews beforehand to see which currencies are accepted. Additionally, some Australian online casinos may charge a fee for converting currencies, so be sure to check if any fees apply before making a deposit at the Australian casino site.