sir john william thomson-walker, obe, dl, frcs (born 6 aug. 1871, died 5 oct. 1937, aged 67) was a scottish surgeon, hunterian professor of surgery at the royal college of surgeons of england and a leader in the field of urology. he was knighted in 1922, was president of the urology section of the royal society of medicine in 1922, president of the medical society of london in 1933 and president of the société internationale d'urologie congress in 1933.