Frederick St John, 2nd Viscount Bolingbroke

Frederick St John, 2nd Viscount Bolingbroke, 3rd Viscount St John (21 December 1732 – 5 May 1787), was a British Viscount and landowner. His father was John St John, 2nd Viscount St John, half-brother of Henry St John, 1st Viscount Bolingbroke (1678–1751). His mother was Anne Furnese and his younger brother General the Hon. Henry St John (1738–1818).