Q1 Tower (an abbreviation of Queensland Number One) is a 322.5-metre (1,058 feet ) skyscraper in Surfers Paradise, Queensland, Australia. The residential tower on the Gold Coast has been the world's tallest residential building from 2005 to 2011. As of 2020 it is the ninth-tallest residential tower in the world and is the tallest building in Australia and the Southern Hemisphere, and the second-tallest freestanding construction in the Southern Hemisphere, behind the Sky Tower in Auckland, New Zealand.
The Q1 formally opened in November 2005. The landmark building was recognised as one of Queensland's icons during the state's 150th-birthday celebrations.