As a nation, Australia does not hold "sister city" arrangements; rather, it engages in bilateral treaties and strategic partnerships with other countries. However, its major municipalities maintain deep cultural and economic "sister city" relationships across the globe. Notable examples include:
- **Sydney**: San Francisco (USA), Nagoya (Japan), Wellington (New Zealand), Florence (Italy). - **Melbourne**: Osaka (Japan), Boston (USA), Milan (Italy), Thessaloniki (Greece). - **Brisbane**: Kobe (Japan), Auckland (New Zealand), Chongqing (China). - **Perth**: Houston (USA), San Diego (USA), Megisti (Greece). - **Adelaide**: Austin (USA), Christchurch (New Zealand).
