Richard Reader Harris, K.C. (1847 – 25 March 1909) was a prominent English barrister, King's Counsel and Master of the Bench of Gray's Inn, who was also a Methodist minister, founder of the Pentecostal League of Prayer, and author of 34 Christian books. He is particularly remembered as an advocate of British Israelism, the belief that people of Western European descent are also the direct lineal descendants of the Ten Lost Tribes.