The Deputy Premier of New South Wales is the second-most senior officer in the Government of New South Wales. The deputy premiership has been a ministerial portfolio since 1932, and the deputy premier is appointed by the Governor on the advice of the Premier.

The New South Wales government, also known as the NSW government, is the governing body of New South Wales, Australia. The executive government comprises 11 portfolios, led by a ministerial department and supported by several agencies. There are also a number of independent agencies that fall under a portfolio but remain at arms-length for political reasons, such as the Independent Commission Against Corruption and Electoral Commission. The state Executive Council, consisting of the governor and senior ministers, exercises the executive authority through the relevant portfolio.