HMS Sylvia was an Adonis-class schooner of the Royal Navy during the Napoleonic War.

She was proceeding through the Sunda Strait when near Krakatoa she had three times to deal with attacks by pirate proas.

Sylvia drove the proa ashore and destroyed it after first removing the vessel's 6-pounder gun.

Sylvia sighted a lugger proa at anchor under Krakatoa that got under weigh as the British approached.

Drury sent Sub-Lieutenant Chesnaye and another party of volunteers in the proa that Sylvia had captured on 7 April.

When Sylvia finally caught up with the two, the British were about to board the pirate lugger proa, which was putting up a stiff resistance.

The two transports were 12 days out of Surabaya and were carrying "Artillery Equipage and valuable European Goods.

In 1847, the Admiralty awarded the Naval General service Medal with clasp "Sylvia 26 April 1810" to the single surviving claimant from the action.

In January 1819 Parliament voted a grant to the crews of the vessels, including Sylvia, that had served under the command of Lord Viscount Keith in the Channel in 1813 and 1814.

[11] Sylvia was under the command of Captain Boxwell (or Boxell, or Buxall) when she wrecked on the Bissagoa Shoals, off the coast of Africa.

[12] Lloyd's List reported the loss on 3 February 1824, suggesting that Sylvia was lost in late 1823.