Calvin Chong Ket Kiun is a Malaysian politician who has served as Member of the Sabah State Legislative Assembly (MLA) for Elopura since May 2018. He is a member of Heritage Party (WARISAN) and was formerly a member of the Democratic Action Party (DAP), a component party of the Pakatan Harapan (PH) coalition.
On 20 January 2022, Calvin, along with Sri Tanjong assemblyman Justin Wong Yung Bin and former senator quit DAP. Chong and Wong subsequently joined WARISAN on 26 March.