Q1 (meaning Queensland Number One) is a skyscraper located in Surfers Paradise, on the Gold Coast. It lost its title as the world's tallest residential tower to the 348 metre building The Marina Torch in Dubai on 29 April 2011. As of May 2012, it is the fifth tallest such building. Q1 is the tallest building in Australia and the Southern Hemisphere when measured to the top of its spire (second tallest building behind Eureka Tower in Melbourne, when measured to roof and highest habitable floor) and the second-tallest free-standing structure in the Southern Hemisphere, behind Auckland's Sky Tower. It opened in November 2005.
The landmark building was recognised as one of Queensland's icons during the state's 150th birthday celebrations. Q1 has been identified as a potential terrorism target for the region. For a short period of time, an apartment in the building, which was bought for A$9 million by a Japanese restaurateur, was the most expensive ever paid for in Queensland.