Sir William McMillan 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.
- Occupation
- politician, businessperson
- Position held
- Member of the New South Wales Legislative Assembly, Member of the New South Wales Legislative Assembly, Treasurer of New South Wales, member of the Australian House of Representatives
- Citizenship
- Australia
