Yong Khoon Seng (; born 22 December 1941) was the Member of the Parliament of Malaysia for the Stampin constituency in Sarawak, representing the Sarawak United Peoples' Party (SUPP), from 1999 until 2013. He was a Deputy Minister of Works in the ruling Barisan Nasional coalition government.
Yong entered Parliament in 1990 for the seat of Padawan. He was immediately appointed as a Parliamentary Secretary. Before entering politics, he was a pharmacist, graduating from the University of Queensland. He was born in Betong, Sarawak.
However, at the 2013 general election, Yong lost his seat to a Democratic Action Party (DAP) candidate, Julian Tan Kok Ping.
Election results + Parliament of Malaysia Percentage figures based on total turnout (including votes for other candidates not listed).YearConstituencyCandidateVotesPctOpponent(s)VotesPctBallots castMajorityTurnout1990P158 Padawan (SUPP)16,36262.66%Cheng Hui Hong (DAP)9,75137.34%26,6926,61167.99%1995P170 Padawan (SUPP)19,25872.33%Akaw Nonjep (IND)7,36827.67%27,86711,89088.09%1999P170 Stampin (SUPP)18,81061.86%Voon Lee Shan (DAP)9,91332.60%31,0988,89760.91%Chua Chio Kuia (IND)1,6845.54%2004P196 Stampin (SUPP)21,15561.18%Voon Lee Shan (DAP)13,42438.82%35,8067,73159.87%2008 (SUPP)21,96651.01%Voon Lee Shan (DAP)18,89643.88%43,9223,07065.30%See Chee How (PKR)2,1985.10%2013Yong Khoon Seng (SUPP)22,99335.43% (DAP)41,66364.20%65,51518,67077.32%Soo Lina (STAR)2390.37%
Honours
Officer of the Order of the Defender of the Realm (KMN) (1991)
Officer of the Order of the Defender of the State (DSPN) – Dato' (1999)
Commander of the Order of the Star of Hornbill Sarawak (PGBK) – Datuk (2013)
References