The goddess of truth and justice in ancient Egyptian religion is Ma’at.
Ma’at was both a goddess and the principle of truth, balance, order, morality, and justice. Ancient Egyptians understood these ideas as part of the force that kept the universe stable, from the movement of the stars and seasons to fair conduct in human society. Her opposite was Isfet, the disorder and chaos that threatened cosmic harmony.
Ma’at is usually depicted as a woman wearing an ostrich feather, her defining emblem. That feather played a central role in the judgment of the dead. In the Weighing of the Heart ceremony, a deceased person’s heart was measured against Ma’at’s feather. A heart that was not weighed down by wrongdoing could pass safely into the afterlife; an unworthy heart faced destruction by Ammit.
Pharaohs were expected to uphold Ma’at through law, ritual, and responsible rule, and they were sometimes shown presenting a small figure of the goddess to another deity. A common mistake is treating Ma’at as only a justice goddess: she also personified truth, harmony, cosmic balance, and proper order.