The Kena Upanishad (Sanskrit: केन उपनिषद्,), is one of the "primary" Upanishads, a genre of Vedic scriptures, commented upon by Shankara and Madhvacharya. It is associated with the Samaveda where it is found inserted into the last section of the Jaiminiya Upanishad Brahmana. It figures as number 2 in the Muktika canon of 108 Upanishads.
The Kenopanishad derives its name from the first word Kena , meaning ‘by whom’. It belongs to the Talavakara Brahmana of Sama Veda and is therefore also referred to as Talavakara Upanishad. It has four khaṇḍas (sections), the first two in verse and the other two in prose. Adi Shankara, who has written commentaries on 12 Upanishads, is believed to have written two commentaries on Kenopanishad. One is called Kenopaniṣad Padabhāṣya and the other is Kenopaniṣad Vākyabhāṣya.