William Prowse CB (1752 – 23 March 1826) was an officer of the Royal Navy, who saw service during the American War of Independence, and the French Revolutionary and Napoleonic Wars. Rising from humble origins and joining the navy as an able seaman, he had a highly active career, serving under some of the most famous naval commanders of the age of sail, and participating in some of their greatest victories. He was at Grenada and Martinique under Byron and Rodney, the Glorious First of June under Howe; and commanded ships at Cape St Vincent under Jervis, Cape Finisterre under Calder and Trafalgar under Nelson. He finished his career by serving with distinction in the Mediterranean, and died with the rank of Rear-Admiral.