Hayagriva Upanishad or Hayagrivopanishad (Sanskrit: हयग्रीव उपनिषद्) is one of 108 Upanishad, written in Sanskrit language. It is a minor Upanishad, dedicated to Hayagriva - the horse-faced avatar of the god Vishnu. It belongs to the Vaishnava sect, which worships Vishnu, and is associated with the Atharvaveda.