Q1 Tower is a 322.5-metre supertall skyscraper in Queensland, Australia. The residential tower on the Gold Coast was the world's tallest residential building from 2005 to 2011. As of 2023, it is the tallest building in Australia, the second tallest building in the Southern Hemisphere, and the third-tallest free-standing structure in the Southern Hemisphere, behind the Autograph Tower in Jakarta, Indonesia, and the Sky Tower in Auckland, New Zealand. The Q1 officially opened in November 2005.