---
type: Reference
title: "Chāndogya Upaniṣad"
description: "A major Sāmaveda Upaniṣad; source of the mahāvākya 'tat tvam asi.'"
tags:
  - primary-source
  - Upanishad
  - shruti
darshana:
  - Vedānta
timestamp: "2026-06-24"
okf_version: "0.2"
---

# Chāndogya Upaniṣad

## What It Is

One of the oldest and most cited Upaniṣads, attached to the Sāmaveda. It contains the teaching of Uddālaka to Śvetaketu culminating in the mahāvākya 'tat tvam asi' (That thou art).

## Why It Matters Here

Cited for Brahman and the identity of Ātman and Brahman.
