Yang Berhormat Tuan Chong Chieng Jen (simplified Chinese: 张健仁; traditional Chinese: 張健仁; pinyin: Zhāng Jiànrén; Pe̍h-ōe-jī: Tiuⁿ Kiān-jîn; Pha̍k-fa-sṳ: Chông Khien-ìn, born 12 February 1971), is a Malaysian politician and lawyer who has served as Chairman of the National Institute of Occupational Safety and Health (NIOSH) since February 2024,[1] State Leader of the Opposition of Sarawak from June 2013 to November 2020 and again since March 2024, Member of Parliament (MP) for Stampin since May 2018 and Member of the Sarawak State Legislative Assembly (MLA) for Padungan since December 2021.

[11] In 2011, he once again, he defended his state seat, this time against Yap Chin Loi, with a majority vote of 4,824.

[15][16] Following incumbent Stampin MP Julian Tan Kok Ping's decision to retire from politics,[17] Chong moved to contest the Stampin parliamentary seat against SUPP president Sim Kui Hian in the 14th Malaysian general election (GE14) on 9 May 2018, which was seen as a 'grey' or unsafe seat following redelineation by the Election Commission (EC).

[18] His special assistant, Kelvin Yii Lee Wuen, contested for the Bandar Kuching seat.

[23][24] In the 12th Sarawak state election, Chong's special assistant, Michael Kong Feng Nian was selected to contest in Kota Sentosa[25][26] whereas Chong went on to contest in the Padungan state seat against the mayor of Kuching South, Datuk Wee Hong Seng.