William Unwin was born 10 December 1871 in Greenwich, Greater London, England, United Kingdom to Edward Unwin (1840-1933) and Elizabeth Spicer (1841-1921) and died 25 December 1945 Timaru, Canterbury, New Zealand of unspecified causes. He married Phyllis Agness Florence Hall (-) 1904 in New Zealand.
|#g1: Offspring of Edward Unwin (1840-1933) and Elizabeth Spicer (1841-1921)|
|Edward Unwin (1870-)||,||,|
|William Howard Unwin (1871-1945)||10 December 1871, Greenwich, Greater London, England, United Kingdom||25 December 1945, Timaru, Canterbury, New Zealand||Phyllis Agness Florence Hall (-)|
|Sidney Unwin (1873-1962)||1873, Hatcham, Kent, England, United Kingdom||30 May 1962, Omakau, Otago, New Zealand||Grace Ethelwyn Stalley (1880-1961)|
|Mabel Lizzie Unwin (1874-1933)||,||,|
|Basil Unwin (1876-1877)||,||,|
|Cyril Unwin (1878-1933)||1878, Lewisham, Greater London, England, United Kingdom||26 April 1933, Canterbury, New Zealand||Grace Eugenie Curline (-1970)|
|Ella Unwin (1880-)||,||,|
|Bernard Unwin (1881-1941)||,||,|
|Stanley Unwin (1884-1968)||19 December 1884, Handen Road, Lee, Greater London, England, United Kingdom||13 October 1968, England, United Kingdom||Alice Mary Storr (1883-1971)|
|Offspring of William Unwin and Phyllis Agness Florence Hall (-)|
|Desmond Unwin (1905-)|
|Edward Unwin (1906-1984)|
|Basil Unwin (1907-1933)|
|Dorothy (Peggy) Margaret Unwin (1910-)|
|Peter Christopher Stanley Unwin (1912-1986)|
William became one of Timaru's most honoured citizens in his capacity as a doctor.
Unwin Lodge is an alpine hut named after Dr Unwin, who was a notable mountaineer in his spare time. It "is the flagship of the NZAC hut network. The lodge was rebuilt in 2012 and sits at the entrance to Aoraki Mt Cook National Park."