Prarthana Samaj was founded in Mumbai, India.

_{The Prarthana Samaj or Prayer Society was a movement for religious and social reform in Bombay, India, based on the pre-Reformation movements. The Prarthana Samaj was founded by Atmaram Pandurang on 31 March 1867 when Keshub Chandra Sen visited Maharashtra. It aimed to make people believe in and worship one God.  It became popular after Mahadev Govind Ranade joined.}