William Preston Snyder (October 7, 1851 – June 18, 1920) was an American physician and politician who served as President Pro Tempore of the Pennsylvania Senate from 1899–1902 and Pennsylvania Auditor General from 1904–1907. He was a member of the Republican Party from Chester County. In 1908, Snyder was convicted in a graft scandal involving the furnishing of the Pennsylvania State Capitol and received a two-year prison sentence for conspiracy to defraud the state.