Clare Winnicott (née Clare Nimmo Britton, known as "Elsie"; 30 September 1906 – 17 April 1984) OBE was an English social worker, civil servant, psychoanalyst and teacher. She played a pivotal role in the passing of The Children's Act of 1948. Alongside her husband, D. W. Winnicott, Clare would go on to become a prolific writer and prominent social worker and children's advocate in 20th century England.