HMS Guachapin was a brig, the former Spanish letter of marque Guachapin, which the British captured in 1800 and took into service with the Royal Navy in 1801. Under the British flag she captured a Spanish privateer larger and better-armed than herself. She also served at the captures of the islands of St. Bartholomew, St. Martin, St. Thomas, St. Croix, Tobago, and St. Lucia, and of Surinam. She served at Antigua as a guard ship but was wrecked in 1811. She was then salved and sold.