Windsor Castle was launched at Yarmouth in 1804. She spent her entire 11-year career as a Falmouth packet, primarily on the Falmouth–Halifax–New York–Halifax–Falmouth route and the Falmouth–Leeward Islands–Falmouth route. She also sailed on some other voyages. She was involved in two notable single-ship actions. In the first, in 1807, she captured her attacker, a French privateer schooner, in a sanguinary encounter. In the second, in 1815, an American privateer captured her. A prize crew took her into Norfolk, Virginia, where she was sold at auction.
