William Hillier Holborow(23 December 1841 – 10 July 1917) was an Australian politician.
He was born in Sydney to linen draper Daniel Holborow and his wife Mary. He was educated privately and became a storekeeper at Richmond. On 27 July 1864 he married Amelia Town; they had ten children. He formed the Richmond Volunteer Rifles as a lieutenant in 1870, becoming a captain in 1871, a lieutenant colonel in 1881 and a colonel in 1896. A Richmond alderman, he was mayor from 1872 to 1876. In 1880 he was elected to the New South Wales Legislative Assembly as the member for Argyle. A Free Trader, he held his seat until his retirement in 1894. In 1899 he was appointed to the Legislative Council, where he remained until his death at Croydon in 1917. He was appointed a Companion of the Order of St Michael and St George and awarded a Volunteer Officers' Decoration in 1896.
|New South Wales Legislative Assembly|
| Member for Argyle
Served alongside: Myers/Gannon/Parkes/Tait/Ball