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Atlantis may refer to:
- The now disestablished Kingdom of Atlantis (September 2003 - October 2005)
- The Republic of Atlantis, formerly of St.Charlie (February 2010 - 2016)
- The canton of Atlantis in Esse
- The Empire of Atlantium
- The Empire of Nova Atlantis, a predecessor to the modern New Lviv.
- The Republic of Greater Atlantis
- The People's Empire of Atlantis
- The Republic of New Atlantis