Castalia is the name of a nymph in Greek and Roman mythology and a spring in Delphi named after her.

Castalia or Kastalia may also refer to:

Places Castalia, Iowa, United States Castalia, Ohio, United States, a village in Erie County Castalia, North Carolina, United States, a town in Nash County Castalia, Grand Manan Island, Canada, part of the Village of Grand Manan Castalia, a spring at Daphne, Antioch

Astronomy 4769 Castalia (previously known as '1989 PB'), a near-Earth asteroid discovered by Eleanor Helin in 1989; the first asteroid observed by radar 646 Kastalia, a Main Belt asteroid discovered by August Kopff in 1907 The Castalia meteorite of 1874, which fell in North Carolina, United States (see meteorite falls) A macula of Europa.

Music Castalia, an instrumental track in the 1979 album Solid State Survivor by Yellow Magic Orchestra Castalia (album), a Mark Isham album

Other uses Castalia (bivalve), a genus of bivalves in the family Hyriidae Castalia, a synonym for Nymphaea, a plant genus Castalia (spacecraft), a proposed European Space Agency space probe Castalia (simulator), a wireless network simulator Castalia, a fictional province in Hermann Hesse's The Glass Bead Game , an experimental cross-Channel ferry which was later converted to a hospital ship Castalia House, a book publishing company founded by writer Vox Day

See also Nou Estadi Castàlia, a football stadium in Castelló de la Plana, Spain