Nicola D'Ascenzo (September 25, 1871, Torricella Peligna, Italy – April 13, 1954, Philadelphia, Pennsylvania) was an Italian-born American stained glass designer, painter and instructor. He is best known for creating stained glass windows for the Washington Memorial Chapel in Valley Forge, Pennsylvania; the Nipper Building in Camden, New Jersey; the Loyola Alumni Chapel of Our Lady at Loyola University Maryland; the Folger Shakespeare Library and Washington National Cathedral, both in Washington, D.C.