William Bagwell (1776 – 4 November 1826) was an Irish Tory politician who served for more than twenty years as a Member of Parliament (MP) in the United Kingdom House of Commons. He was the son of John Bagwell, M.P., and Mary, née Hare. He was the Member of Parliament for Rathcormack in the Parliament of Ireland from 1798 until the Union with Great Britain at the end of 1800, when the constituency of Rathcormack was disenfranchised. He resided at the family mansion at Marlfield, Clonmel.