Grit Müller (born 6 June 1972) is a retired German swimmer who won a silver medal in the 800 m freestyle at the 1991 World Aquatics Championships and a bronze medal in the 400 m individual medley at the 1989 European Aquatics Championships. She also won six national titles in the 4×200 m relay (1988), 400 m freestyle (1991), 800 m freestyle (1990) and 400 m medley (1989–91).