London Arch (formerly London Bridge) is an offshore natural arch formation in the Port Campbell National Park, Australia. The arch is a significant tourist attraction along the Great Ocean Road near Port Campbell in Victoria. This stack was formed by a gradual process of erosion, and until 1990 formed a complete double-span natural bridge.

The span closer to the shoreline collapsed unexpectedly on 15 January 1990, leaving two tourists stranded on the outer span before being rescued by helicopter. No one was injured in the event. Prior to the collapse, the arch was known as London Bridge because of its similarity to its namesake.