Bidadari is a housing estate and a subzone of Toa Payoh planning area, in the Central Region of Singapore.

Toa Payoh is a planning area and mature residential town located in the northern part of the Central Region of Singapore. Toa Payoh planning area borders Bishan and Serangoon to the north, the Central Water Catchment to the northwest, Kallang to the south, Geylang to the southeast, Novena to the west and Hougang to the east. Toa Payoh New Town is situated in the western portion of the Toa Payoh planning area. The latter occupies a much larger area, encompassing estates such as Potong Pasir and Bidadari.