The Bukit Timah Nature Reserve (Chinese: 武吉知马自然保护区) is a small 1.64 square kilometer (410 acre) nature reserve near the geographic centre of the city-state of Singapore, located on the slopes of Bukit Timah Hill and parts of the surrounding area. The nature reserve is about 12 kilometres from the Downtown Core, Singapore's central business district.

Despite its small size, it is considered one of the most productive pieces of nature, particularly by Alfred Russel Wallace. 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.

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