The Singapore River (Malay: Sungei Singapura, Chinese: 新加坡河) is a river that runs parallel to Alexandra Road and feeds into the Marina Reservoir in the southern part of Singapore. The immediate upper watershed of the Singapore River is known as the Singapore River Planning Area, although the northernmost part of the watershed is classified under River Valley planning area.

Singapore River planning area sits within the Central Area of the Central Region of Singapore, as defined by the Urban Redevelopment Authority. The planning area shares boundaries with the following - River Valley and Museum to the north, Tanglin and Bukit Merah to the west, Outram to the south and the Downtown Core to the east.