Tan Kim Seng JP (18 November 1805 – 14 March 1864), was a prominent Straits-born Chinese[1] merchant and philanthropist in Singapore in the 19th century.

Tan donated generously to the building and maintenance of a school for boys known as Chui Eng Institute (Chinese: 萃英書院; pinyin: Cuìyīng Shūyuàn; Pe̍h-ōe-jī: Chūi-eng Su-īⁿ).

One of Tan's best-known donations was the sum of $13,000 in 1857 towards building Singapore's first public waterworks to ensure a better freshwater supply to the town.

In 1882, possibly out of shame and to mark the British colonial government's appreciation, the fountain was installed in Fullerton Square to perpetuate his name.

A European guest who was there at his first ball, said of the feast: Upon his death in 1864, Tan had amassed immense wealth that stemmed most notably from his control over Singapore's waterworks system and his own real estate holdings.

One of the last landscape vestiges connected with the Tan family in this area is the house, Panglima Prang (Admiral of the Fleet) on River Valley Road.