Yes, you will need health insurance to apply for an Australian visa, as it is one of the main prerequisites for most Australian visa types. You must have a valid health insurance (Overseas Student Health Cover - OSHC) if you are applying for an Australian student visa, and (Overseas Visitor Health Cover - OVHC) for temporary and work visas. While health insurance is not compulsory for short-term visas, it is advised to have valid health insurance for certain visas to avoid visa cancellations or rejections.