The Principal Upanishads by Dr. S. Radhakrishnan is a scholarly and authoritative translation and commentary on the major Upanishads, the foundational philosophical texts of Hinduism. Combining precise translations with detailed introductions and insightful notes, Dr. Radhakrishnan illuminates the profound teachings of Vedanta, including the nature of the Self (Atman), Ultimate Reality (Brahman), karma, rebirth, moksha (liberation), and the pursuit of spiritual knowledge. Bridging classical Indian thought with modern philosophical inquiry, this landmark work is an invaluable resource for students, scholars, and spiritual seekers interested in the timeless wisdom of the Upanishads.