Donald Woods Winnicott FRCP (7 April 1896 – 25 January 1971) was an English paediatrician and psychoanalyst who was especially influential in the field of object relations theory and developmental psychology. He was a leading member of the British Independent Group of the British Psychoanalytical Society, President of the British Psychoanalytical Society twice (1956–1959 and 1965–1968), and a close associate of Marion Milner.