It is not a matter of great wonder that Sree Narayana Guru became one of the greatest proponents and re-evaluators of Advaita Vedanta, the principle of non-duality put forward by AdiSankara, for both hail from the same pristine land of Kerala. Only a span of a thousand years separates both. Sree Narayana Guru further extended this non dualistic principle into practical modes of self-realisation through spiritual education, compassion, and peaceful coexistence of humanity. Guru's philosophy emphasised the consistency between true existence of the “common reality” on earth and one Divine behind the creation and sustenance of the Universe, dismissing any concepts of illusory worlds. This paper deals with Sree Narayana Guru as an advaitin, his concepts of consciousness, Non-consciousness, Bhana darsana, Unity of Jiva and Brahman etc. Guru's works are divided into Mystical, Metaphysical, Socio-ethical and Aesthetical, in which his Metaphysical works contains all his concepts of Advaita Vedanta. The famous philosophical works are Darsanamala, Atmopadesasatakam, Advaita Dipika, Daiva Dasakam, Brahmavidya Panchakam, Vedanta Sutra, Nirvriti Panchakam, Sloka Trayi and Homa Mantra