William Riddell

William Riddell (1807–1847) was a Roman Catholic bishop who briefly served as the Vicar Apostolic of the Northern District of England in 1847.

He was born at Felton Park, near Morpeth, Northumberland, England on 5 February 1807, the son of Ralph Riddell and Elizabeth Blount. He began his education at Stonyhurst College in Lancashire on 21 September 1817, and then to the English College, Rome on 29 November 1823, where he completed his theological studies. He was ordained a sub-deacon on 22 March 1828, a deacon in August 1829, and a priest in March 1830. After leaving Rome for England on 1 August 1830, he had a brief period as secretary to Cardinal Weld. In June 1832, he began as an assistant in the mission in Newcastle upon Tyne, and subsequently taking charge of the mission.

He was appointed coadjutor to the Vicar Apostolic of the Northern District, Bishop Francis George Mostyn, on 22 December 1843. On the same day, he was appointed Titular Bishop of Lagania, and was consecrated to the Episcopate by Bishop John Briggs on 17 March 1844. On the death of Bishop Mostyn on 11 August 1847, Riddell briefly succeeded as Vicar Apostolic of the Northern District.

He died in office at Charlotte Street, Newcastle upon Tyne on 2 November 1847, aged 40, of typhus contracted while ministering to the victims of an epidemic, and is buried in the vaults of St Mary's Cathedral, Newcastle upon Tyne.