The Muṇḍaka Upanishad is one of the older, "primary" (mukhya) Upanishads commented upon by Shankara. It is associated with the Atharvaveda. It figures as number 5 in the Muktika canon of 108 Upanishads.

It is a Mantra-upanishad, i.e. it has the form of a Mantra. But, as the commentators observe, though it is written in verse, it is not, like other Mantras, to be used for sacrificial purposes. Its only object is to teach the highest knowledge, the knowledge of Brahman, which cannot be obtained either by sacrifices or by worship (upâsana), but by such teaching only as is imparted in the Upanishad.With its beautiful style, lucid metres, serious wording, and lofty feelings each mantra of this Upanishad gives joyous reading.It might have derived its name from the word "Munda" meaning "Shaven Head". The assumption is that if the principle thought of this Upanishad is understood, the illusions of material

It has three chapters and each chapter is divided into sub chapters which are called "Khanda". In total this Upanishad has 64 Mantras.

As descibed in the beginning of this upanishad, it is said to be first told by Brahma to his son Atharva and Atharva taught it to Satyavaha and Satyavaha passed it to Angiras who in turn passes the knowledge to Shaunaka, dialogue between two forms content of this Upanishad.

This Upanishad divides all knowledge into two categories.The knowledge that leads to Self Realization is called Para Vidya or Divine Knowledge and everything else is called Apara Vidya or Knowledge of Material world. It is the first text to mention the six disciplines of Vedanga.

This Upanishad expounds the greatness of Para Vidya.

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Mundaka Upanishad is famous because the word "Satyameva jayate" which is written in Indian Nation Emblem of four lion is taken from Mundaka Upnishads.