Sachindra Nath Sanyal (3 April 1890 — 7 February 1942) was an Indian revolutionary and co-founder of the Hindustan Republican Army (HRA, which after 1928 became the Hindustan Socialist Republican Association) that was created to carry out armed resistance against the British Empire in India. He was a mentor for revolutionaries like Chandra Shekhar Azad and Bhagat Singh.