The Bukit Timah Nature Reserve is a small 1.64 square kilometre nature reserve near the geographic centre of the city-state of Singapore, located on the slopes of Bukit Timah Hill, Singapore's highest hill standing at a height of 163.63 metres, and parts of the surrounding area. The nature reserve is about 12 kilometres from the Downtown Core, Singapore's central business district.
Together with the neighbouring Central Catchment Nature Reserve, it houses over 840 species of flowering plants and over 500 species of fauna. Today, it is one of the largest patches of primary rainforest left in Singapore.
The forest reserve was formally declared as an ASEAN Heritage Park on 18 October 2011.