Parramatta () is a major commercial suburb and centre in Greater Western Sydney, located in the state of New South Wales, Australia. It is located approximately 24 kilometres (15 mi) west of the Sydney central business district on the banks of the Parramatta River. Parramatta is the administrative seat of the local government area of the City of Parramatta and is often regarded as the main commercial centre and the central business district for the broader Greater Western Sydney region. Parramatta also has a long history as a second administrative centre in the Sydney metropolitan region, playing host to a number of state government departments as well as a registry for federal courts.

Parramatta, founded by the British in 1788, the same year as Sydney, is the oldest inland European settlement in Australia and the economic capital of Greater Western Sydney. Since 2000, government agencies such as the New South Wales Police Force and Sydney Water have relocated to Parramatta from the centre of Sydney. Established in 1799, the Old Government House is a world heritage site and museum within Parramatta Park and is Australia oldest surviving public building. It is sometimes called the “cradle city” of Australia because of its significant farming contribution to help feed the whole colony.

Parramatta is a major business and commercial centre, and home to Westfield Parramatta, the tenth largest shopping centre in Australia. Parramatta is also the major transport hub for Western Sydney, servicing trains and buses, as well as having a ferry wharf and future light rail and metro services. Major upgrades have occurred around Parramatta railway station with the creation of a new transport interchange, and the ongoing development of the Parramatta Square local government precinct.