Indefatigable was a square-rigged, three-decked, three-masted merchant ship launched in 1799 at Whitby for James Atty & Co. for the West Indies trade. In 1804 she served as an armed defense ship and recaptured a merchantman that a privateer had captured. She was a transport in the 1805–1806 British invasion of the Dutch Cape colony. She twice transported convicts to Australia; on the first trip she was chartered to the British East India Company (EIC). She burned to the waterline in 1815.