Walter Boyd was the East Indiaman Oosthuizen of the Dutch East India Company. Oosthuizen was launched in 1789 and made one voyage to the Far East. She was on her second voyage in 1794 when the British seized her. In 1795 British interests purchased her and named her Walter Boyd. She made one voyage for the British East India Company. She then became a West Indiaman. On her last voyage, in 1801, Walter Boyd captured a Spanish schooner but then foundered on the way back to London from Martinique.