Cheo Chai Chen (Chinese: 蒋才正; pinyin: Jiǎng Cáizhèng, 1951 – 4 June 2024) was a Singaporean politician and businessman.

[2] Cheo first stood for Parliament at the 1988 general election, where he was defeated by Ng Pock Too of the governing People's Action Party (PAP) in Nee Soon Central.

Cheo was one of three SDP MPs to be elected – with the party's leader Chiam See Tong retaining his seat in Potong Pasir, and Ling How Doong winning in Bukit Gombak.

[6] In 1994, Chiam resigned as the SDP's leader after a dispute with the rest of the party's Central Executive Committee (which included Cheo).

[7] After he publicly criticised them, the Central Executive Committee attempted to expel Chiam from the party (which would have forced him to vacate his parliamentary seat), but he won a court case to prevent them from doing so on procedural grounds.

At the 2001 general election, Cheo stood as a member of the SDP's team in the Hong Kah Group Representation Constituency.

During the election campaign, Cheo drew considerable criticism for telling reporters that Tin's status as a new mother was "her weakness" and saying that she might spend more time focusing on her child than on her constituents.