Gillian Evelyn Joynson-Hicks, Viscountess Brentford, OBE (née Schluter; born 22 November 1942) is a British evangelical Anglican and activist. She served as the Third Church Estates Commissioner, one of the most senior lay people in the Church of England, from 1999 to 2005. She was also President of the Church Mission Society (CMS) between 1998 and 2007.