HMS Firm

Six ships of the Royal Navy have been named HMS Firm or Firme.
 * HMS Firm (1759), a 60-gun fourth rate ship of the line, launched on 15 January 1759. She served as a prison hulk at Portsmouth from 1784, until broken up in 1791.
 * HMS Firm (1794), a 16-gun floating battery, primarily based at Sheerness, launched in 1794 and disposed of in 1803.
 * HMS Firm (1804), a 12-gun Archer-class gun-brig, launched in 1804, and wrecked off the coast of France on 28 June 1811.
 * HMS Firme (1805), formerly the 74-gun SPANISH SHIP Ferme captured at the battle of Cape Finisterre (1805), which served as a prison hulk at Plymouth until sold in 1814.
 * HMS Firm (1855), a mortar vessel, launched on 1 March 1855, renamed Mortar Vessel 11 later that year, and disposed of in 1858.
 * HMS Firm (1879), a 2nd class Gun Boat, launched in 1879, and stationed at Queensferry up to 1890.