Sir Marcus Edward Setchell, KCVO FRCS FRCOG (born 4 October 1943) is a leading British obstetrician and gynaecologist and the former Surgeon-Gynaecologist to Queen Elizabeth II's Royal Household.
Educated at Felsted School and Cambridge University. After training at Gonville and Caius College Cambridge University and St Bartholomew's Hospital, London, Setchell specialised in obstetrics and gynaeocology.
In 1975 he became the consultant gynaecologist and obstetrician at St Bartholomew's Hospital, and also at Homerton Hospital following its opening in 1986, holding both positions until 2000. He was a consultant at: Whittington Hospital (2000–2008); King Edward VII Hospital for Officers; director of the Fertility Unit at the Portland Hospital (1987–94): med director of the Homerton Hospital (1994–1997). His last position before retirement from the National Health Service (NHS) in 2008 was as consultant obstetrician and gynaecologist at the Whittington Hospital, London.