George Hubbard Clapp (1858–1949) was an American pioneer in the aluminum industry and also a numismatist.He was born on December 14 in Allegheny City, Pennsylvania, now a part of Pittsburgh, the son of Delia Dennig Hubbard and DeWitt Clinton Clapp, an iron company executive. He graduated from the Western University of Pennsylvania, today's University of Pittsburgh, in 1877.