HMS St George was a 120-gun first rate ship of the line of the Royal Navy, launched on 27 August 1840 at Plymouth. While in the dockyard and before being put to sea she was at risk of destruction. The dockyard suffered severe damage in a large scale fire on 25 September 1840; it started in the North Dock on HMS Talavera (1818) and HMS Imogene (1831) were completely gutted, threatened HMS Minden (1810), and spread to nearby buildings and equipment. Estimates for the damage were put at £150,000 in the values of the day, and would have totalled £500,000 had the fire not been contained by demolishing several surrounding buildings. She was fitted with screw propulsion in 1859, and was sold out of the service in 1883.