Chandogya Upanishad forms a part of the Chandogya Brahmana of the Sama Veda. It is one of the largest Upanishads. It has eight chapters, each voluminous with many verses. Swami Swahananda, who was a senior monk of the Ramakrishna Order and a minister of the Vedanta Society of Southern California from 1976 to 2012, has translated the Upanishad into English. He has exercised utmost care in supplying word for word translation. He has also given a brief but useful notes based on Sri Sankara’s commentary and the gloss of Anandagiri. Swami Vimalananda, who was one of the outstanding scholarly monks of the Ramakrishna Order, has given a mastery introduction to the translated work. It supplies a guideline to the reader in arriving at the facts, expressions, customs, concepts, traditions, and doctrines that find their origin or a place in the text.