William Patrick Auld (27 May 1840 – 2 September 1912), usually known as W.P. Auld, Pat or Patrick, was an Adelaide, South Australian vigneron and wine merchant born in Stalybridge (near Manchester, England). He took part in John McDouall Stuart's sixth expedition (Dec 1861 – Dec 1862) which successfully crossed Australia from south to north. He was also a member of B. T. Finniss's 1864 expedition to select a capital for the Northern Territory, during which an incident occurred resulting in his being tried for murder of an Aboriginal man.