• Born date: 1737-07-20
  • Born in: Pennsylvania
  • Death date: 1804-04-16
  • Death in: Pennsylvania
William Maclay (Pennsylvania senator)

William Maclay (July 20, 1737 – April 16, 1804) was a politician from Pennsylvania during the eighteenth century. Maclay, along with Robert Morris, was a member of Pennsylvania's first two-member delegation to the United States Senate. Following his tenure in the Senate, he served in the Pennsylvania House of Representatives on two separate occasions, as a county judge, and as a presidential elector.