London Arch is a natural arch in the Port Campbell National Park, Australia. The arch located at 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 arch closest to the shoreline collapsed unexpectedly on 15 January 1990, leaving two tourists stranded on the outer part until they were rescued by a helicopter. Prior to the collapse, the arch was known as London Bridge because of its similarity to its namesake.