Walter Griffith (died 1779) was an officer of the Royal Navy during the American War of Independence.Griffith was of an old family long settled in Merionethshire. He was promoted to be a lieutenant in the navy on 7 May 1755, and served at that rank on board the 60-gun Eagle from 1755 to 1757, the 100-gun HMS Royal George when she carried Lord Anson's flag in the summer of 1758, and under Sir Edward Hawke in 1759. On 4 June 1759 he was promoted to the command of the 18-gun sloop HMS Postilion.