Alexander Mair was an Australian politician who served as Premier of New South Wales from 5 August 1939 to 16 May 1941. Born in Melbourne, Mair worked in various businesses there before moving to Albury, New South Wales where he went on to be a member of the New South Wales Legislative Assembly for fourteen years. In 1932, Mair was elected to the seat of Albury and was re-elected a further four times. He rose quickly through the cabinet of Bertram Stevens' United Australia Party government, becoming an Assistant Minister in April 1938, Minister for Labour and Industry in June and Colonial Treasurer in October.

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.