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Tartarus (タルタロス, Tarutarosu)? is a massive tower that appears each night at Gekkoukan High School during the Dark Hour in Persona 3.

SEES is formed in an attempt to discover the true nature of the tower and defeat the Shadows. This location is the only place where the player can fight Shadows, except when they appear in outside locations during a Full Moon Operation.

Because it "grows" out of the ground each night, the layout of the tower is assembled randomly, aside from certain key floors that never change. The tower consists of 6 blocks, where every section contains a specific Arcana's Guardian blocking anyone from climbing to the top. Each new block is inaccessible until the Major Shadows are defeated on each full moon, thus limiting the progress through the tower.

There are 264 floors in total, including the roof and excluding the optional Monad underground dungeon which consists of 10 floors.According to the ancient Greek poet Hesiod's Theogony, Tartarus is both the name of the third primordial deity that represents deep darkness, as well as a location described as being far below the earth. It is a deep abyss - even far below Hades - where divine beings that pose a threat to the gods of Olympus ie. the Titans were imprisoned. It further served as a dungeon of torment for mortal souls, as divine punishment for their wicked deeds in life.