William Alexander Erskine West-Erskine , M.A., (12 September 1839[1] – 25 October 1892[2]) was a politician in South Australia.

William James West, M.A., Rector of Delgany, Ireland, by his marriage with Elmina, eldest surviving daughter and co-heir of Alexander Erskine, of Bulhall, county Forfar, and Longhaven, county Aberdeen, was born at Annamoe, County Wicklow, Ireland, and was educated at Christ Church, Oxford.

[1] Having emigrated to South Australia, he was member for Mount Barker in the South Australian House of Assembly from 1872 to 1875, including eight months as Commissioner of Public Works in the Boucaut Government from June 1875 to February 1876.

He attended the Centennial Exposition in Philadelphia, United States as a commissioner for South Australia in 1876.

[1] West-Erskine was elected to the South Australian Legislative Council in May 1885, but retired in 1891,[3] when he returned to England.