William Nugent, 3rd Baron Nugent of Riverston (died 1756) was a grandson of Richard Nugent, 2nd Earl of Westmeath (died 1641) via his son Thomas Nugent, 1st Baron Nugent of Riverston, (died 1715). He resided at Pallas, in east County Galway.
He married Bridget Daly of Cloghan, County Offaly (a cousin of), widow of Patrick Kirwan of County Galway, who died before 1719. Their children were: