Sir Robert Armstrong-Jones, CBE JP DL FRCS FRCP FSA (born Robert Jones; 2 December 1857 – 30 January 1943) was a Welsh physician and psychiatrist.

He was born in Ynyscynhaearn, Caernarvonshire, the son of Thomas Jones, a Congregational minister and small landed proprietor at Eisteddfa, Criccieth, and Elizabeth, daughter of Robert Jones, of Eisteddfa.

[1] Becoming a specialist in the treatment of mental illness, he worked as a junior medical officer at the Royal Earlswood Institution and Colney Hatch during the 1880s, and became resident physician and superintendent of Earlswood Asylum in 1888.

In 1893 he became the first superintendent of the London County Council's Claybury Asylum,[1] where he developed new treatments.

[2] Jones lectured at St Bartholomew's Hospital, and became consulting physician in mental diseases to the military forces at London and Aldershot.