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The number of works that go by the name Upanishad and available today in print exceeds 200. The Muktikopanishad gives a list of 108 Upanishads. However, the principal Upanishads are accepted to be those which Adi Sankaracharya who lived between 788 and 820 A.D. chose to comment upon.  

The number of works that go by the name Upanishad and available today in print exceeds 200. The Muktikopanishad gives a list of 108 Upanishads. However, the principal Upanishads are accepted to be those which Adi Sankaracharya who lived between 788 and 820 A.D. chose to comment upon.  

Sankara was the earliest commentator on the Upanishads. He chose only 10 Upanishads for his commentaries. According to some scholars he commented upon 11 Upanishads. He refers to 4 more Upanishads in his commentary on Brahma Sutra namely Svetasvatara  Upanishad, Kousitaki Upanishad, Jaabaala Upanishad, Mahanarayana Upanishad, and Paingala Upanishad.

Sri Sankaracharya was the earliest commentator on the Upanishads. He chose only 10 Upanishads for his commentaries. According to some scholars he commented upon 11 Upanishads. He refers to 4 more Upanishads in his commentary on Brahma Sutra namely Svetasvatara  Upanishad, Kousitaki Upanishad, Jaabaala Upanishad, Mahanarayana Upanishad, and Paingala Upanishad.

Considering the ones chosen by him for commenting and as reference material as the most ancient and authentic, they are termed as major or principal Upanishads. We may list them as follows:

Considering the ones chosen by him for commenting and as reference material as the most ancient and authentic, they are termed as major or principal Upanishads. We may list them as follows: