Cyrus was a whaler launched at Salem in 1800. She performed one whaling voyage for French owners before a British letter of marque captured her in 1803. From 1804 on, she performed 17 whaling voyages for British owners in the almost half a century between 1804 and 1853. The first five were for Samuel Enderby & Sons. Between 1 August 1834 and 2 June 1848 her captain was Richard Spratly, namesake of Spratly Island and the group of islands and reefs known as the Spratly Islands. She apparently made one last voyage in 1854, but then no longer traded. She was last listed in Lloyd's Register in 1856.