William McMillan (Australian politician)

The Honourable Sir William McMillan KCMG
Member of the Australian Parliament for Wentworth
In office 29 March 1901 – 23 November 1903
Preceded by	New seat
Succeeded by	Willie Kelly
Personal details
Born	(1850-11-14)14 November 1850 Derry, Ireland
Died	21 December 1926(1926-12-21) (aged 76) Bellevue Hill, New South Wales
Nationality	Irish Australian
Political party	Free Trade Party
Spouse(s)	1) Ada Charlotte Graham (divorced 1891) 2) Helen Maria O'Reilly
Occupation	Businessman

Sir William McMillan KCMG (14 November 1850 – 21 December 1926) was an Australian businessman and politician. He was a member of the first federal parliament and served as deputy leader of the Free Trade Party under George Reid, but served only a single term before resigning. He had earlier served in the Parliament of New South Wales, including as Colonial Treasurer, and was prominent in the movement for Federation. He was born in Ireland and became a successful businessman in Australia after moving to Sydney at the age of 18.