Roger Sinclair Kirby FRCS, FEBU is a British retired prostate surgeon and professor of urology. He is prominent as a writer on men's health and prostate disease, the founding editor of the journal Prostate Cancer and Prostatic Diseases and Trends in Urology and Men's Health and a fundraiser for prostate disease charities, best known for his use of the da Vinci surgical robot for laparoscopic prostatectomy in the treatment of prostate cancer. He is a co-founder and president of the charity The Urology Foundation, vice-president of the charity Prostate Cancer UK, trustee of the King Edward VII's Hospital, and from 2020 to 2024 was president of the Royal Society of Medicine, London.
Following his medical education and training at St John's College, Cambridge, and Middlesex Hospital, London, and with a distinction in surgery, Kirby took various surgical posts across England. In 1979 he gained fellowship of the Royal College of Surgeons of England.