The Tavistock Institute of Human Relations is a British charity concerned with group behaviour and organisational behaviour. It was launched in 1946, when it separated from the Tavistock Clinic.
Perhaps the most influential figure to emerge from the Institute was the psychoanalyst Isabel Menzies Lyth. Her seminal (1959) paper 'A case study in the functioning of social systems as a defence against anxiety' inspired a whole of organisational theory focused on unconscious forces that shape organisational life.
Many of these founding members of the Tavistock Institute went on to play major roles in psychology. John Rawlings Rees became first president of the World Federation for Mental Health.