Brisbane serves as the capital and largest city of the Australian state of Queensland. Situated at the centre of South East Queensland, a bio-geographical region with an estimated population of 4.1 million as of 2024, it lies on a peninsula of the Brisbane River approximately 15 kilometres from its mouth at Moreton Bay. The city forms the inner area of Greater Brisbane, which sprawls across the hilly floodplain of the Brisbane River Valley between the Pacific Ocean and the Taylor and D'Aguilar mountain ranges. It is the third-most populous city in Australia.

The region has been inhabited for over 22,000 years by Indigenous peoples including the Yagara, Turrbal, and Quandamooka. The Moreton Bay penal settlement was established at Redcliffe in 1824 before moving to North Quay in 1825, named after Governor Sir Thomas Brisbane. Free settlement expanded following the closure of the penal station in 1842, and in 1859, Brisbane became Queensland's capital upon separation from New South Wales. The city later served as the Allied command base in the South West Pacific during World War II.

The central business district is defined by its riverfront location and leafy, open spaces within a garden metropolis setting. Notable landmarks include the Story Bridge, City Hall, King George Square, and the South Bank Parklands. The area features significant architecture such as Parliament House and the Treasury Building, alongside the Queensland Art Gallery and Gallery of Modern Art. The surrounding region includes UNESCO World Heritage Gondwana Rainforests, Glass House Mountains, and Moreton Bay.

Brisbane is a diverse city with over 36% of its metropolitan population being foreign-born, frequently ranked among the world's most liveable cities. It has hosted major events including the 1982 Commonwealth Games, World Expo 88, the 2014 G20 summit, and will host the 2032 Summer Olympics. The city offers a pleasant pace of life with year-round warm climate and spectacular scenery, attracting domestic and international visitors to its galleries, museums, and natural attractions.

The population of Brisbane is 2,706,966 as of 2023. It operates as a major transport hub served by extensive rail, bus, and ferry networks, along with Brisbane Airport and the Port of Brisbane. The city maintains a youthful enthusiasm and forward-thinking character despite rapid development. Its humid subtropical climate and accessible, friendly atmosphere contribute to its status as one of Australia's fastest-growing cities.