| Honorific-Prefix: | Yang Berhormat Tuan |
| Chew Seh Yong | |
| Native Name Lang: | zh-my |
| Honorific-Suffix: | MLA |
| Office1: | Member of the Negeri Sembilan State Executive Council |
| Term Start1: | 10 February 2023 |
| Term End1: | 14 August 2023 |
| 1Blankname1: | Menteri Besar |
| Predecessor1: | Arul Kumar Jambunathan |
| Successor1: | Jalaluddin Alias Veerapan Superamaniam Teo Kok Seong |
| Constituency Am2: | Lobak |
| Assembly2: | Negeri Sembilan State Legislative |
| Term Start2: | 9 May 2018 |
| Predecessor2: | Siow Kim Leong (PR–DAP) |
| Majority2: | 11,782 (2018) 13,504 (2023) |
| Constituency Am3: | Bahau |
| Assembly3: | Negeri Sembilan State Legislative |
| Term Start3: | 5 May 2013 |
| Term End3: | 9 May 2018 |
| Predecessor3: | Teo Kok Seong (PR–DAP) |
| Successor3: | Teo Kok Seong (PH–DAP) |
| Majority3: | 5,136 (2013) |
| Birth Name: | Chew Seh Yong |
| Birth Date: | 3 February 1962 |
| Party: | Democratic Action Party (DAP) |
| Otherparty: | Pakatan Rakyat (PR) Pakatan Harapan (PH) |
Chew Seh Yong (born 3 February 1962) is a Malaysian politician who has served as Member of the Negeri Sembilan State Legislative Assembly (MLA) for Lobak since May 2018. He served as Member of the Negeri Sembilan State Executive Council (EXCO) in the Pakatan Harapan (PH) state administration under Menteri Besar Aminuddin Harun from February to August 2023 and MLA for Bahau from May 2013 to May 2018.[1] He is a member of the Democratic Action Party (DAP), a component party of the PH and formerly Pakatan Rakyat (PR) coalition. He is also the shortest-serving Negeri Sembilan EXCO Member in the recent history of the state, in office for slightly more than just 6 months.
| Constituency | Candidate | Votes | Pct | Opponent(s) | Votes | Pct | Ballots cast | Majority | Turnout | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2013 | N08 Bahau | Chew Seh Yong (DAP) | 9,998 | 67.28% | Yee Mee Faa (MCA) | 4,862 | 32.72% | 15,148 | 5,136 | 82.13% | ||||
| 2018 | N11 Lobak | Chew Seh Yong (DAP) | 13,647 | 87.46% | Lim Kok Kian (MCA) | 1,865 | 11.95% | 15,795 | 11,782 | 82.70% | ||||
| bgcolor= | Balamurugan Sanmugam (PAP) | 92 | 0.59% | |||||||||||
| 2023 | Chew Seh Yong (DAP) | 14,357 | 94.39% | bgcolor= | Ng Soon Lean (GERAKAN) | 853 | 5.61% | 15,321 | 13,504 | 66.06% | ||||