Teo Chee Hean is a Singaporean politician and former two-star rear-admiral who has been serving as Senior Minister of Singapore since 2019 and Coordinating Minister for National Security since 2015. A member of the governing People's Action Party, he has been the Member of Parliament (MP) representing the Pasir Ris West division of Pasir Ris–Punggol GRC since 2001.

Senior Minister of Singapore is a position in the Cabinet of Singapore. Holders of this office have previously served as either the prime minister or the deputy prime minister. Among the executive branch officeholders in the order of precedence, the position ranks after the prime minister and the deputy prime minister. Senior Ministers also serve as part of the Prime Minister's Office (PMO) and work at The Istana.