From 1947 to 1961, Mitford-Barberton was a member of the Royal Society of British Sculptors, 1957-1961 a Fellow of the Society and a member of the Theosophical Lodge Cape Town.
Von 1947 bis 1961 war Ivan Mitford-Barberton Mitglied der Royal Society of British Sculptors, von 1957 bis 1961 Fellow der Gesellschaft sowie Mitglied der Cape Town Theosophical Lodge.