The secretary of the Cabinet is a senior public servant in New Zealand. The Cabinet secretary usually serves concurrently as the clerk of the Executive Council. The secretary is responsible for the impartial recording of Cabinet decisions, and as clerk of the Executive Council they are also a liaison between the Cabinet and the governor-general. The secretary is also responsible to Cabinet as a collective for ensuring the confidentiality of Cabinet proceedings, and the impartial and effective operation of the Cabinet system. The current Cabinet Secretary and Clerk of the Executive Council is Rachel Hayward.

The Cabinet of New Zealand is the New Zealand Government's body of senior ministers, accountable to the New Zealand Parliament. Cabinet meetings, chaired by the prime minister, occur once a week; in them, vital issues are discussed and government policy is formulated. Cabinet is also composed of a number of committees focused on specific areas of governance and policy. Though not established by any statute, Cabinet wields significant power within the New Zealand political system, with nearly all government bills it introduces in Parliament being enacted.