Townsville City is a coastal suburb located at the centre of the City of Townsville in Queensland, Australia. It sits along the northern-eastern bank of Ross Creek at its mouth on the Coral Sea, bounded by the sea to the north and east, and Castle Hill to the west. The land is mostly low-lying near sea level, with Melton Hill creating a natural boundary to the north-west. This area serves as the city's central business district and functions as a major hub for businesses across all sectors in the Northern Australia region.

The suburb is situated on the traditional country of the Wulgurukaba Aboriginal people and takes its name from Robert Towns, a merchant who supported pastoral development in the Ross River area. The area has a rich religious history, with Baptist services starting in 1888 and the construction of a brick church in 1922 using bricks from a disused powder magazine. St Anne's Church of England Girls’ School opened in 1917 before moving to Mundingburra in 1958, while Townsville State High School began in the CBD in 1924. The area contains numerous heritage-listed sites reflecting its long development.

The dominant land use is commercial, featuring office towers such as Northtown Office Tower and Verde Tower, alongside headquarters for companies like Wilmar International and Adani Australia. Significant construction has occurred over the last two decades, including Flinders Lane for the Australian Taxation Office and the Queensland Country Bank Stadium, which opened in February 2020. Key landmarks include Castle Hill, which offers views of Magnetic Island, and the historic Sturt Street area where early religious buildings were erected.

Cultural amenities include CityLibraries Townsville at Flinders Street and the Perc Tucker Gallery, which focuses on North Queensland artists. The suburb hosts the annual Northern Australia Festival of Arts and the Sunday Cotters Markets held every Sunday in Flinders Street. While there are no schools within the suburb itself, it serves as a central point for regional government offices and private enterprises, acting as a hub for northern Queensland with extensive public transport connections via Kinetic bus services.

In the 2021 census, the suburb of Townsville City had a population of 2,945 people. The area enjoys a dry tropical climate characterized by dry winters and wet, humid summers, with average summer highs peaking at 31 °C. Access is provided via Townsville Airport, located ten kilometers west, and the Bruce Highway. Public transport includes services from Sunbus and taxis operating twenty-four hours a day, facilitating movement between the city centre, suburbs, and nearby attractions like Magnetic Island.