Ask how many Upanishads there are and you will get answers ranging from ten to over two hundred. Both are correct, which is confusing until you understand what the word is doing.
Upanishad is not a title. It is a category. Texts have been composed under that heading for well over two thousand years, and new ones appeared as late as the medieval period and arguably later. The Muktika Upanishad, itself an Upanishad, lists 108, which is where that number comes from.
But when scholars or teachers say the Upanishads, they usually mean a much smaller group: the principal or mukhya Upanishads, the ones that are genuinely ancient, that are attached to the Vedic corpus, and that the major commentators treated as authoritative.
The principal Upanishads
The list below is the set most commonly treated as principal, with the Veda each is attached to and a rough chronological placement. Dates are contested and should be read as approximate.
| Upanishad | Veda | Approximate period | Known for |
| Brihadaranyaka | Yajur | Pre-Buddhist, c. 7th-6th c BCE | The oldest and longest. Yajnavalkya’s dialogues, the neti neti formula |
| Chandogya | Sama | Pre-Buddhist, c. 7th-6th c BCE | The tat tvam asi teaching, the salt-in-water demonstration |
| Aitareya | Rig | Early | Consciousness as the ground of reality |
| Taittiriya | Yajur | Early | The five koshas, the sheaths of the self |
| Kaushitaki | Rig | Early | Prana, the vital breath, as the central principle |
| Kena | Sama | Middle | The question of what impels the mind |
| Katha | Yajur | Middle, c. 5th c BCE | Nachiketa and Death. The chariot analogy. Earliest clear use of yoga in the technical sense |
| Isha | Yajur | Middle | Eighteen verses. Renunciation and action held together |
| Shvetashvatara | Yajur | Later middle | Theistic in tone. Bridges toward devotional traditions |
| Mundaka | Atharva | Later | The two birds on one tree. Higher and lower knowledge |
| Prashna | Atharva | Later | Six questions on breath, sleep and the syllable Om |
| Mandukya | Atharva | Late, prose | Twelve verses on the four states of consciousness. Shortest and among the most influential |
| Maitri | Yajur | Latest of the group | Sometimes excluded. Longer, more systematic |
Shankara, in the eighth or ninth century, wrote commentaries on most of these, and his selection is a large part of why this particular group became the canon.
What changed with them
The Vedic hymns are largely outward facing. Offerings are made, gods are addressed, results are sought. The Upanishads turn the attention around and ask what the person making the offering actually is.
Three moves define the shift.
The first is the identification of atman, the innermost self, with brahman, the ground of all reality. The Chandogya makes it with the phrase tat tvam asi, usually rendered as you are that, though the Sanskrit is grammatically debated and the translation is not as settled as popular sources imply.
The second is negation as a method. The Brihadaranyaka answers questions about the self with neti neti, not this, not this. Every description offered is rejected, not because the self does not exist but because it is not an object that description reaches.
The third is that liberation replaces heaven as the goal. The Vedic ritual aimed at outcomes: rain, cattle, sons, a good afterlife. The Upanishads propose that these are all still within the cycle, and that what is worth wanting is release from the cycle entirely.
The famous passages
The Katha Upanishad opens with a boy, Nachiketa, given away to Death by his father in a fit of temper. Death is not home. The boy waits three days without food, and Death, embarrassed by the breach of hospitality, offers three boons. The third is the question of what happens after death, and Death tries hard to change the subject, offering wealth, long life, and every pleasure. The boy refuses them all.
The same text gives the chariot analogy that runs through later yoga philosophy: the body is the chariot, the intellect the driver, the mind the reins, the senses the horses.
The Chandogya has the demonstration with salt. A father tells his son to put salt in water and come back the next morning. The salt cannot be seen. Taste it here, at the edge, in the middle: it is salt everywhere. The father’s point is that the subtle essence pervading everything is what the boy himself is.
The Mundaka gives the two birds on one tree, one eating the fruit and the other watching without eating: the experiencing self and the witnessing self.
Where to start
Not at the beginning. The Brihadaranyaka is the oldest and it is long, dense and ritually technical in places.
Start with the Katha for the narrative, the Isha for its brevity, and the Mandukya for its compression. Then go to the Chandogya, then the Brihadaranyaka.
Patrick Olivelle’s translation is the scholarly standard in English and has strong notes. Eknath Easwaran’s is warmer and more devotional, better suited to reflective reading than to study. Robert Hume’s older version is free online and remains usable. Reading a traditional commentary alongside is worthwhile, because these texts were never intended to be read alone.
Frequently asked questions
How many Upanishads are there? The Muktika lists 108, and over two hundred texts carry the name. Between ten and thirteen are treated as principal, and those are the ancient ones attached to the Vedas.
Which are the principal Upanishads? Commonly the Brihadaranyaka, Chandogya, Aitareya, Taittiriya, Kaushitaki, Kena, Katha, Isha, Shvetashvatara, Mundaka, Prashna and Mandukya, with the Maitri sometimes included.
What is the oldest Upanishad? The Brihadaranyaka is generally regarded as the oldest, along with the Chandogya, with both usually dated before the rise of Buddhism.
What does tat tvam asi mean? It is usually translated as you are that, identifying the individual self with ultimate reality. The precise grammar of the phrase is debated among scholars.
What is neti neti? A method of negation from the Brihadaranyaka, meaning not this, not this, used to strip away every describable thing until what remains is the self that cannot be objectified.
Which Upanishad should I read first? The Katha, for its narrative structure, or the Isha, which runs to eighteen verses. The Brihadaranyaka is the richest but is a difficult starting point.
Sources
Primary: Patrick Olivelle, Upanisads (Oxford World’s Classics, 1996) and his fuller The Early Upanisads: Annotated Text and Translation (1998), which is the scholarly standard in English. Robert Ernest Hume, The Thirteen Principal Upanishads (1921), freely available and still usable. Eknath Easwaran’s translation for reflective reading.
Modern scholarship: Signe Cohen, The Upanisads: A Complete Guide (2018), which is the best single reference on the corpus and its dating. Olivelle’s introductions, which set out the chronological arguments. For the commentarial tradition, Shankara’s bhashyas on the principal texts, available in several English translations.
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