William Mair (died 14 October 1897) was a politician in the British colony of South Australia.
Son of William Mair of Jersey, he arrived in South Australia around 1853, and found employment with Philip Levi & Co.
He left to join the Public Service, then was appointed secretary of Wallaroo Mines Ltd.
He was secretary of Adelaide Underwriters' Association Ltd. from 1888 to the time of his death.
[1] He represented The Sturt in the South Australian House of Assembly from September 1874 to February 1875, and vigorously supported the establishment of railways to Glenelg and Brighton.