The 1971 Grand Prix German Open was a combined men's and women's tennis tournament played on outdoor red clay courts.

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.

[3] 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 Heide Orth / Jürgen Fassbender defeated Helga Hösl / Harald Elschenbroich 6–4, 3–6, 6–2