This volume contains Sri Aurobindo’s translations of and commentaries on the Isha Upanishad. His translations of and commentaries on other Upanishads and Vedantic texts, and his writings on the Upanishads and Vedanta philosophy in general, are published in Kena and Other Upanishads, volume 18 of THE COMPLETE WORKS OF SRI AUROBINDO. The present volume is divided into two parts. The first consists of Sri Aurobindo’s final translation and analysis of the Isha Upanishad. This is the only work in this volume that was published during his lifetime. It contains his definitive interpretationof the Isha Upanishad.