The Aitareya Upanishad (Sanskrit: ऐतरेय उपनिषद् IAST Aitareyopaniṣad) is a Mukhya Upanishad, associated with the Rigveda. It comprises the fourth, fifth and sixth chapters of the second book of Aitareya Aranyaka, which is one of the four layers of Rig vedic text.
