Siddhantasara (pronounced [sɪd'ðantsar]; transl. The Gist of Principles) is a 1889 Gujarati book on the history of philosophy by Indian writer and philosopher Manilal Dwivedi. It is a historical critique of the world's religious philosophies. The book deals with the evolution of religious sentiment and attempts to establish the superiority of the Advaita philosophy over other religious philosophies.