William Garvin (born 1835) was an American sailor who fought in the American Civil War. Garvin received his country's highest award for bravery during combat, the Medal of Honor. Garvin's medal was won for his actions during the First Battle of Fort Fisher on board the U.S.S. Agawam. He was posthumously honored with the award on December 31, 1864. Garvin was from Canada and entered service in Plymouth, Connecticut. Garvin was one of 30 Canadians to win the Medal of Honor.