The 1971 Grand Prix German Open was a combined men's and women's tennis tournament played on outdoor red clay courts. It was the 63rd edition of the tournament. The event was part of the 1971 Pepsi-Cola Grand Prix circuit and categorized as a B Class tournament. It took place at the Am Rothenbaum in Hamburg, West Germany, from 17 May through 23 May 1971. Andrés Gimeno and Billie Jean King won the singles titles.
Andrés Gimeno defeated Péter Szőke 6–3, 6–2, 6–2
Billie Jean King defeated Helga Masthoff 6–3, 6–2
John Alexander / Andrés Gimeno defeated Dick Crealy / Allan Stone 6–4, 7–5, 7–9, 6–4
Rosie Casals / Billie Jean King defeated Helga Masthoff / Heide Orth 6–2, 6–1