Mangai (formerly Mangaia) was the Matoran word for "protector". This can refer to:
- The Toa Mangai, who protected Metru Nui until Teridax hired three Dark Hunters to eliminate them. The last member of the team, Lhikan, died in the Great Cataclysm.
- The Mangai Volcano on Mata Nui, named by the Turaga of Mata Nui after the old Toa team protecting Metru Nui.
- Teridax's lair called Mangaia. He named it after his former job, as a protector of the Matoran.
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