Tiong Bahru is a housing estate and subzone region located within Bukit Merah planning area, in the Central Region of Singapore. Tiong Bahru was constructed in the 1920s by the Singapore Improvement Trust, the predecessor to the Housing Development Board (HDB) and an entity of the British colonial authority providing mass public housing in Singapore and is the oldest housing estate in Singapore.

Bukit Merah, also known as Redhill, is a planning area and new town situated in the southernmost part of the Central Region of Singapore. The planning area borders Tanglin to the north, Queenstown to the west and the Downtown Core, Outram and Singapore River planning areas of the Central Area to the east. It also shares a maritime boundary with the Southern Islands planning area to the south. Bukit Merah is linked to Sentosa Island via Sentosa Gateway, Sentosa Broadwalk, Sentosa Express and the Cable Car.