Margaret Robertson Watt MBE (June 4, 1868 – November 29, 1948) was a Canadian writer, editor and activist. She was a woman of great energy and drive who believed strongly in the power exerted by women working together. She is known to members of Women's Institutes in the United Kingdom for introducing the concepts and practices of the Canadian Women's Institute movement to Britain in 1914. She is remembered internationally as one of the founding members of the Associated Country Women of the World (ACWW) in 1933.