Ganga Prasad Upadhyaya

Pundit Ganga Prasad Upadhyaya (1871-1968) was an Arya Samaji writer. He served as professor of Meerut College at Allahabad University and as chief judge at Tehri, Garhwal District, from which post he retired to serve the Arya Samaj full-time. . He was the father of Swami Satya Prakash Saraswati, another notable Arya Samaji author.

Upadhyaya is notable for producing anti-Christian tracts in the context of the Indian independence struggle under the British Raj and the formative years of the 1947 Republic of India; these include "The Arya Samaj and Christianity" (Allahabad, 1941, 1965) and "Christianity in India" (1956). In The Fountainhead of Religion, he postulates a "common origin from the Vedas" for all world religions.