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.

The Cabinet of Singapore forms the executive branch of the Government of Singapore together with the President. It is led by the Prime Minister who is the head of government. The prime minister is a Member of Parliament (MP) appointed by the president who in the president's judgment is likely to command the confidence of the majority of the Members of Parliament (MPs). The other Ministers in the Cabinet are Members of Parliament appointed by the president acting in accordance with the advice of the prime minister. Ministers are prohibited from holding any office of profit and from actively engaging in any commercial enterprise.