D'Ailly is a surname. Notable people with the surname include:
(1855–1927), Swedish malacologist after whom Aillyidae is named Arnold Jan d'Ailly, mayor of Amsterdam 1946–1956 Pierre d'Ailly (1351–1420), French theologian, astrologer and cardinal of the Roman Catholic Church Sven d'Ailly (1892–1969, Swedish baritone, lute player, director and actor Michel-François d'Ailly (1724–1800), French politician and senator
See also
Ailly (disambiguation) Duke of Chaulnes