Nisargadatta Maharaj (born Maruti Shivrampant Kambli; 17 April 1897 – 8 September 1981) was an Indian guru of nondualism, belonging to the Inchagiri Sampradaya, a lineage of teachers from the Navnath Sampradaya. His teachings emphasize the importance of self-realization and the understanding that the true nature of the self is identical to the ultimate reality.

The publication in 1973 of I Am That, an English translation of his talks in Marathi by Maurice Frydman, brought him worldwide recognition and followers, especially from North America and Europe. Considered the most famous teacher of Advaita since Ramana Maharshi, Nisargadatta Maharaj's approach was direct, provocative, and radical. His best-known work, I Am That, is admired for its straightforward and compelling conversation style, bringing complex non-dual concepts into the reach of the general public.