HMS Bacchus was a schooner of the Adonis class of the Royal Navy during the Napoleonic War.

[2] Still, Bacchus was commissioned under Lieutenant George Skinner and on 9 June was in company with Tartar when Tartar captured the French brig Observateur after a chase and a slight exchange of gunfire.

Observateur, of 18 guns, though pierced for 20, and with a crew of 104 men, was under the command of Captain "Crozier" (Croizé).

She had left Cayenne on 15 March provisioned for a cruise of four months and in company with the French brig Argus, but had not taken anything.

[4] Bacchus then sailed to Britain where she made good defects at Plymouth between 12 September and 29 November.