Detlev Grabs (born 29 October 1960) is a researcher in anatomy and cell biology and a retired East German swimmer. He competed at the 1980 Summer Olympics and won a silver medal in the 4 × 200 m freestyle relay; he failed to reach the finals in the 200 m and 400 m freestyle events. He was also part of the East German team that finished third in the 4 × 200 m freestyle relay at the 1977 European Aquatics Championships.