Mallica Vajrathon (born 1936) is a sociologist, political scientist and former United Nations Senior Staff member. Her grandfather was Joseph Caulfield James, a special tutor to Prince Vajiravudh of Thailand (who later became King), as well being second Chairman of the Royal Bangkok Sports Club. Her father was of of Thailand and her mother is Malee James Vajrathon. Vajrathon was married to Irish writer Erskine B. Childers.