William Lawrence Baillieu (29 April 1859 – 6 February 1936) was an Australian financier and politician. He was a successful businessman, having developed significant business interests from his relatively humble beginnings. He associated with many of the most influential people of his era, and served in the Victorian Legislative Council for 21 years, including stints as Minister for Works and Health and leader of the Legislative Council. As such, he began the Baillieu family dynasty, several members of which remain prominent figures in public life today.