Sir Ronald William Mack (20 May 1904 – 12 February 1968) was an Australian politician.
He was born at Warrnambool to wool buyer Frederick David Mack and Elizabeth Edith Hatton.
On 20 February 1935, he married Helen Isobel Janet Lindsay; they had one son.
He later remarried fellow accountant Winifred Helen Crutchfield on 20 September 1958.
He served in World War II and was twice mentioned in dispatches; he lost his right eye at El Alamein.