HMS Sirius was a Royal Navy ship launched in 1797, originally designed as a 36-gun frigate. It played a significant role during the French Revolutionary Wars and was known for its speed and agility in naval engagements. In 1805, HMS Sirius was converted into a hospital ship and later served in various capacities until it was decommissioned. The ship is notable for its involvement in the Battle of the Nile and its contributions to British naval operations during a tumultuous period in history.