D'Alton is both a surname and a given name. Notable people with the name include:
Surname:
Eduard Joseph d'Alton (1772–1840), German engraver and naturalistJohann Samuel Eduard d'Alton (1803-1854), German anatomist, son of Eduard d'AltonJohn D'Alton (1882–1963), Irish Roman Catholic cardinal and Primate of All IrelandJohn D'Alton (historian) (1792–1867), Irish lawyer and genealogistRob D'Alton (born 1923), Irish sailor and OlympianThomas d'Alton (1895–1968), Australian politicianGiven name:
D'Alton Corry Coleman (1879–1956), Canadian businessmanD'Alton or Dalton McCarthy (1836–1898), Canadian lawyer and parliamentarian