Sawan Singh (27 July 1858 - 2 April 1948),[1] also known as The Great Master or Bade Maharaj ji, was an Indian Saint or Sant.

[3][4] Although he did not refer to himself with these, the following appellations and honorifics have been used to refer to Sawan Singh: Sawan Singh Grewal was born into a Grewal Jat Sikh family in his mother's home at the village of Jatana, District Ludhiana, in pre-partition Punjab.

His father was Subedar Major Sardar Kabal Singh Grewal and his mother was Mata Jiwani Kaur.

During his ministry the Dera expanded greatly, with houses for both permanent residents and guests, a library and a Satsang Hall.

He had initiates from America, England, Switzerland, Germany, most notable of whom being the Americans physician-surgeon Julian Johnson and chiropractic-osteopath Randolph Stone and the Swiss physician-homeopath Pierre Schmidt.