Harrison Ruffin Tyler (born November 9, 1928) is an American chemical engineer, businessperson, and preservationist. He cofounded ChemTreat, Inc., a water treatment company, in 1968 and restored the Sherwood Forest Plantation. He is a son of Lyon Gardiner Tyler as well as the last living grandchild of former U.S. president John Tyler, and speaks on the history of the Tyler family. Tyler purchased Fort Pocahontas in 1996 and advocates for its preservation.