Atlantia may refer to:
Kingdom of Atlantia, a regional designation used within the Society for Creative Anachronism Atlantia (company), an Ireland-based clinical research organisation Atlantia (company), an Italy-based toll road operator Gaia III: Atlantia, an album by the band Mago de Oz Atlantia (book), a 2014 young adult fantasy novel by Ally Condie Atlantia, the third zone in the 2009 video game Henry Hatsworth and the Puzzling Adventure Atlanteia or Atlantia, in Greek mythology was a Hamadryad nymph who consorted with Danaus