Robert Waldby (died 1397) was a native of York and friar of the Order of Saint Augustine who followed Edward, the Black Prince into Aquitaine. After studying at Toulouse, he became professor of theology there. Waldby died on 29 December 1397 with his bishopric being sede vacante on 6 January 1398. He was buried in the Chapel of St. Edmund in Westminster Abbey, where his monumental brass still remains.