Rajnarayan Basu (Bengali: রাজনারায়ণ বসু) (1826–1899) was an Indian writer and intellectual of the Bengal Renaissance. He was born in Boral in 24 Parganas and studied at the Hare School and Hindu College, both premier institutions in Kolkata, Bengal at the time. A monotheist at heart, Rajnarayan Basu converted to Brahmoism at the age of twenty. After retiring, he was given the honorary title of Rishi or sage.