The 1889 New South Wales colonial election was held between 1 February and 16 February 1889. This election was for all of the 137 seats in the New South Wales Legislative Assembly and it was conducted in 37 single-member constituencies, nineteen 2-member constituencies, ten 3-member constituencies and eight 4-member constituencies, all with a first past the post system. Part 1 of the Electoral Act of 1880 had awarded the right to vote to 'every male subject of Her Majesty of the full age of twenty-one years and absolutely free being a natural born or naturalized'. The previous parliament of New South Wales was dissolved on 19 January 1889 by the Governor, Lord Carrington, on the advice of the Premier, George Dibbs.

The premier of New South Wales is the head of government in the state of New South Wales, Australia. The Government of New South Wales follows the Westminster Parliamentary System, with a Parliament of New South Wales acting as the legislature. The premier is appointed by the Governor of New South Wales, and by modern convention holds office by their ability to command the support of a majority of members of the lower house of Parliament, the Legislative Assembly.