HMS Demerara was the mercantile schooner Anna that the British Royal Navy purchased in 1804.

The Royal Navy recaptured her and she returned to service that year as HMS Anna.

Within an hour the privateer had caught up with her quarry and started firing small arms and a broadside.

[4] In February Shipley had encountered a French three-masted schooner privateer, the former HMS Demerara.

Wilson and Shipley resisted for an hour and three-quarters until after he was severely wounded, as were the mate and the steward, and she had had four men killed.