Deborah Muir (née Humphrey; born June 12, 1953) is a Canadian former synchronized swimmer and coach. She began her career with the Calgary Aquabelles club in 1965 and won silver medals in the synchronized swimming team competitions at both the 1971 Pan American Games and the 1973 World Aquatics Championships. At age 20, Muir retired from competition and began a career in coaching. She coached swimmers of the Calgary Aquabelles to 22 national titles over a decade. She also helped athletes clinch medals in the World Aquatics Championships, the FINA Cup, the Commonwealth Games, the Pan American Games and the Summer Olympic Games. Muir has won various awards for her coaching career, and is an inductee of the Alberta Sports Hall of Fame, the Canadian Olympic Hall of Fame, Canada's Sports Hall