Adhyatma Upanishad or Adhyatmopanishad is one of the 108 Upanishadic Hindu scriptures, written in Sanskrit. It is one of the 19 Upanishads under the Shukla Yajurveda or White Yajurveda. It is classified as a Samanya (non-sectarian) Upanishad. It is also known as Upanishad The Upanishad expounds on the nature of Brahman.