Ruth Nicholson FRCOG (2 December 1884 -18 July 1963) was an English obstetrician and gynaecologist who served as a surgeon in the Scottish Women's Hospital at Royaumont, France during the First World War. For this work she was awarded the Croix de Guerre and the Médaille d’Honneur des Épidémies by the French government. After the war she specialised in obstetrics and gynaecology as Clinical Lecturer and Gynaecological Surgeon at the University of Liverpool with consultant appointments at Liverpool hospitals. She was a founder member of the Royal College of Obstetricians and Gynaecologists in 1929, being elevated to fellow of the College in 1931.