Datuk Seri Tiong King Sing is a Malaysian politician. He is currently the Member of the Parliament of Malaysia for the Bintulu constituency in Sarawak, representing the Sarawak Progressive Democratic Party (SPDP) in the governing Barisan Nasional coalition.
Tiong was originally a member of the Sarawak National Party but was dismissed in 2002 for what the party cited as disciplinary reasons. He subsequently joined the SPDP. In 2007 he became involved in a dispute with police administration alleging that criminal gangs were acting with impunity throughout Sarawak but that his concerns were not being addressed by police. His outspokenness was reported to have triggered a large police operation against criminal organisations in the State. Tiong subsequently received mail threats, including a parcel of shotgun cartridges, at his constituency office. At the subsequent election, he successfully defended his seat receiving 73% of the vote.
Tiong is also a businessman, having been the chief executive officer of Kuala Dimensi Sdn Bhd. He is currently being sued by Malaysian Chinese Association leader, and fellow Barisan Nasional member, Ong Tee Keat for defamation. The suit arises from an allegation made by Tiong, which Ong denies, that Tiong donated 10 million Malaysian ringgit to Ong.