Sir Marriott Fawckner Nicholls CBE, FRCS, (12 May 1898 – 25 August 1969) was an English surgeon who specialised in the genitourinary tract. He served in the British Army in both the First and Second World Wars and was dean of the medical school at St George's Hospital for 20 years. At the age of 64 he became professor of surgery at the University of Khartoum in Sudan, where he maintained the position until his death five years later.