HMS Implacable (1805)
 HMS Implacable was a 74-gun third rate of the Royal Navy. She was originally the French Navy's Téméraire-class ship of the line Duguay-Trouin launched in 1800.She survived the Battle of Trafalgar only for the British to capture her at the subsequent Battle of Cape Ortegal. In British service she participated in the capture of the Imperial Russian Navy 74-gun ship of the line Vsevolod (Russian: Всеволод) in the Baltic in 1808 during the Anglo-Russian War.