Sir William Hall-Jones KCMG (16 January 1851 – 19 June 1936) was the 16th Prime Minister of New Zealand from June 1906 until August 1906. Hall-Jones entered parliament in 1890, later becoming a member of the Liberal Party. He was interim prime minister from the death of Richard Seddon to the return from overseas of Joseph Ward. Hall-Jones was a mild mannered man with a fully earned reputation as an outstanding administrator. Seddon famously said of him, "He is the best administrator I have in my Cabinet." From 1908 to 1912, Hall-Jones was New Zealand's High Commissioner to the United Kingdom.