Rainer Jacob (born 15 September 1946) is a retired German swimmer who won a silver medal in the 4 × 100 m freestyle relay at the 1970 European Aquatics Championships.

[1] He finished sixth in the same event at the 1972 Summer Olympics.

[2] His mother, Gisela Jacob-Arendt, and uncle, Heinz Arendt, were German Olympic swimmers.

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