| Honorific-Prefix: | Yang Berhormat Tuan |
| Joseph Ng Soon Siang | |
| Native Name Lang: | zh-my |
| Honorific-Suffix: | MLA |
| Assembly: | Penang State Legislative |
| Constituency Am: | Air Itam |
| Predecessor: | Wong Hon Wai |
| Term Start: | 9 May 2018 |
| Birth Name: | Joseph Ng Soon Siang |
| Citizenship: | Malaysian |
| Party: | DAP |
| Otherparty: | Pakatan Harapan |
| Occupation: | Politician |
Joseph Ng Soon Seong is a Malaysian politician. A member of the Democratic Action Party (DAP), he has been the member of the Penang State Legislative Assembly representing Air Itam since 2018.
| Constituency | Candidate | Votes | Pct. | Opponent(s) | Votes | Pct. | Ballots cast | Majority | Turnout | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2018 | N33 Air Itam | Joseph Ng Soon Seong (DAP) | 12,588 | 79.80% | Tan Kah Leong (Gerakan) | 3,047 | 19.30% | 15,988 | 9,541 | 81.50% | ||||
| bgcolor= #F616D6 | Kang Teik Woi (MUP) | 148 | 0.90% | |||||||||||
| 2023 | Joseph Ng Soon Seong (DAP) | 12,456 | 79.20% | bgcolor= | Cheang Chee Gooi (GERAKAN) | 3,267 | 20.80% | 15,873 | 9,185 | 68.76% | ||||