| Election Name: | 2018 Balakong by-election |
| Country: | Selangor |
| Type: | parliamentary |
| Ongoing: | no |
| Previous Election: | 2018 Malaysian general election |
| Previous Year: | 2018 |
| Next Election: | 2023 Selangor state election |
| Next Year: | 2023 |
| Seats For Election: | N27 Balakong seat in the Selangor State Legislative Assembly |
| Election Date: | 8 September 2018 |
| Image1: | PH |
| Candidate1: | Wong Siew Ki |
| Color1: | E21118 |
| Party1: | DAP |
| Alliance1: | PH |
| Popular Vote1: | 22,508 |
| Percentage1: | 84.99% |
| Candidate2: | Tan Chee Teong |
| Color2: | 000080 |
| Party2: | MCA |
| Alliance2: | BN |
| Popular Vote2: | 3,975 |
| Percentage2: | 15.01% |
| Balakong assemblyman | |
| Before Election: | Eddie Ng Tien Chee (died) |
| Before Party: | Pakatan Harapan (DAP) |
| After Election: | Wong Siew Ki |
| After Party: | Pakatan Harapan (DAP) |
A by-election was held on 8 September 2018 for the Selangor State Legislative Assembly seat of Balakong.[1] The seat became vacant after the death of the incumbent assemblyman, Eddie Ng Tien Chee on 20 July 2018 in a traffic accident on the Cheras–Kajang Expressway.[2] Eddie Ng was a member of the Democratic Action Party (DAP), a component party of the state ruling Pakatan Harapan (PH) coalition. This was the second casual vacancy in the Assembly since the May 2018 general election after Sungai Kandis, which held a by-election in August 2018. The by-election will be held on the same day as the Seri Setia by-election.[3] In the last 2018 general election, Ng defeated Barisan Nasional (BN)'s Malaysian Chinese Association (MCA) candidate, Lim Chin Wah and Mohamad Ibrahim Ghazali of Pan-Malaysian Islamic Party (PAS), with a vote majority of 35,538.[4]
The nomination day was on 18 August 2018.[1] The by-election set for a straight fight between PH's DAP and BN's MCA. While PAS had decided not to contest to make way for the BN candidate, just liked in the case of the Sungai Kandis by-election a month earlier.[5]
Pakatan Harapan retained the seat with a larger share of vote.[6]
Pakatan Harapan (Democratic Action Party)Wong Siew Ki was serving as the Seri Kembangan assemblyman and Selangor state executive councillor Ean Yong Hian Wah’s political secretary and she was also Subang Jaya municipal councillor since 2016 then.[7] She graduated in 2009 from the Universiti Putra Malaysia (UPM).
Barisan Nasional (Malaysian Chinese Association) Tan Chee Teong is a committee member in the Serdang Malaysian Chinese Association (MCA). He is a local of Balakong.
This by-election marks the first time Pakatan Harapan had used their just approved common logo in an election. The then-federal opposition coalition was unable to contest the 2018 general election with their logo due to the Registrar of Societies not approving their registration in time for the election.[5] The registration was finally approved only after the election, which delivered the coalition to power.[8]
Conversely, the MCA will be using their own party logo for the first time since they joined Barisan Nasional in 1973.[5] MCA candidates have normally used the BN common logo in elections up to the 2018 general election.
DAP and Pakatan Harapan's Wong Siew Ki polled 22,058 votes to MCA and Barisan Nasional's Tan Chee Teong's 3,975 votes retaining the seat for DAP and Pakatan Harapan.[6]
Note: 1Tan Chee Teong was a candidate of Malaysian Chinese Association (MCA), who had contested under the MCA banner instead of the BN banner.
PH won all polling districts and post and early votes.