Rainer Jacob (born 15 September 1946) is a retired German swimmer who won a silver medal in the 4 ÃÂ 100 m freestyle relay at the 1970 European Aquatics Championships. He finished sixth in the same event at the 1972 Summer Olympics.
His mother, Gisela Jacob-Arendt, and uncle, Heinz Arendt, were German Olympic swimmers.