The Downtown Core is the historical and downtown centre of the city-state of Singapore and the main commercial area in Singapore excluding reclaimed lands with many integrated resorts such as the Marina Bay Sands, one of the most expensive buildings in the world, with a luxurious standalone casino at Bayfront Avenue. There are many skyscrapers in Raffles Place, Tanjong Pagar and Marina Bay CBD with a height limit of 280m. It is one of the eleven planning areas located within the most urbanised Central Area, forming the latter's dense urban core. It is bounded by Rochor to the north, Kallang to the northeast, Marina East and Marina South to the east, Straits View to the southeast, Bukit Merah to the south, as well as Outram, Museum and Singapore River to the west.

The Central Area, also called the City Area, and informally The City, is the main commercial city centre of Singapore. Located in the south-eastern part of the Central Region, the Central Area consists of eleven constituent planning areas: the Downtown Core, Marina East, Marina South, the Museum Planning Area, Newton, Orchard, Outram, River Valley, Rochor, the Singapore River and Straits View, as defined by the Urban Redevelopment Authority. The term Central Business District (CBD) has also been used to describe most of the Central Area as well, although its boundaries lie within the Downtown Core.