Baba Sawan Singh Grewal (1858–1948), also known as "The Great Master" or "Bade Maharaji" was an Indian Saint. He was the second Satguru of Radha Soami Satsang Beas (RSSB) from the death of Baba Jaimal Singh in 1903 until his own death on April 2, 1948.Before he died he appointed Sardar Bahadur Jagat Singh as his spiritual successor.Disciples of his who after his death have formed separate spiritual missions include Sant Kirpal Singh, Baba Somanath, Pritam Das and Mastana Balochistani.