Atlantis (Ancient Greek Ατλαντίς νῆσος, nesos Atlantis 'island of Atlantis') is the name of a legendary island disappeared at sea, mentioned and described for the first time in the dialogues Timaeus and Critias, texts of the Greek philosopher Plato.

The precise description of the texts of Plato and the fact that they claim that this is a true story, has led, especially since the second half of the nineteenth century during the Romantic period, many conjectures have been proposed on location. However, we now know that the story presents data anachronisms and impossibilities, which would rule out its literal verisimilitude. However, we admit the possibility that the legend was inspired by a background of historical fact linked to a natural disaster, as it could be a flood, a major earthquake or volcanic eruption.

Atlantis has been an inspiration for many literary, musical and film, especially stories of fantasy and science fiction.