William Handcock (c. 1631 – c. 1 July 1707) was an Irish politician.
Originally from Lancashire, Handcock entered the Irish House of Commons in 1661, holding his seat for Westmeath until 1666. He was then appointed to the Council of Connaught and in 1680, he received a grant to erect a manor in Twyford, Westmeath. Handcock represented Athlone from 1692 until 1699 and sat in the following parliament again for Westmeath from 1703 until his death in 1707.
On 25 July 1652, he married Abigail Stanley, daughter of Sir Thomas Stanley and sister of Thomas Stanley. His sons William and Thomas sat also in the Parliament of Ireland.