Zeng Guoyuan (simplified Chinese: 曾国原; traditional Chinese: 曾國原; pinyin: Zēng Guŏyuán; [tsə́ŋ kwǒ ɥɛ̌n]; 1953 – 16 November 2019), also known as Zeng Guoyan, Thomas Chan Hock Seng and, erroneously, Zeng Guoyung, was a Singaporean businessman, philanthropist, politician, author, and acupuncturist.
Zeng entered politics in 1991, when he became a Workers' Party member; thereafter he renounced his affiliation to the group and became a perennial candidate in Singaporean elections, albeit always dropping out of contention at the last minute. Zeng was also an active acupuncturist who arranged for global meetings and operated an acupuncture centre in Singapore, later changing his focus to selling healthcare products after a string of molestation lawsuits initiated by his patients.
Zeng was diagnosed with terminal cancer in 2014; this necessitated the excision of his entire nose, which led to significant facial disfigurement, and he became a tissue paper peddler, abandoning his previous jobs. Zeng was found dead at foot of Geylang Bahru block, Singapore, on 16 November 2019.
Zeng was found dead at the void deck of 68 Geylang Bahru on 16 November 2019 at 21:45 (GMT+8). The cause of death was not immediately known. Zeng's neighbour recounted being awoken by a loud thud and found Zeng lying motionless in a pool of blood.