Joseph Hunter Armstrong (amụrụ na Jenụwarị 24, 2001) bụ onye America na-egwu mmiri. Na 2020 Summer Olympics, o ritere ọla edo na 4x100 mita medley relay
, na-egwu mmiri n'azụ na prelims, ma mechie nke itoolu na 100 mita n'azụ.