Out of the eleven principal Upanishads that Sri Shankaracharya commented upon, this two-volume set contains the translations of eight Upanishads (Isha, Kena, Katha, Mundaka, Mandukya (with Gaudapada Karika), Aitareya, Prashna, and Taittiriya Upanishads) and their commentaries by Sri Shankaracharya. The study of these commentaries by a great philosopher-saint like Shankara is indispensable for the proper evaluation of Vedanta philosophy. It contains the text of the Upanishads in Devanagari, a lucid and faithful translation of the text and commentary, relevant notes, references to quotations, and an index to the texts.