This book is the English translation of Aitareya Upanishad by Swami Sarvananda, who was a disciple of Swami Brahmananda and one of the vice-presidents of the Ramakrishna Order. It contains original mantras, transliteration, construed text (anvaya) with a literal word by word meaning and overall English translation, with useful notes. The book also contains a summary of Aitareya Aranyaka in the introduction.