Ong Ah Teong (; born 26 June 1970) is a Malaysian politician who has served as Member of the Penang State Legislative Assembly (MLA) for Batu Lancang since May 2018. He is a member of the Democratic Action Party (DAP), a component party of the Pakatan Harapan (PH) coalition.
Ong was a member of Penang Island City Council before being nominated to contest in the 2018 Penang state election. He is currently the Chairman of DAP Solok Batu Lancang branch and Communication Secretary for DAP Jelutong division.
Ong tested positive for COVID-19 the second time during the 2023 Penang state election campaign.