| Date: | 17–23 May |
| Edition: | 63rd |
| Category: | Grand Prix circuit (B Class) |
| Surface: | Clay / outdoor |
| Draw: | 64S / 16D |
| Location: | Hamburg, West Germany |
| Venue: | Am Rothenbaum |
| Champms: |  Andrés Gimeno[1] |
| Champws: |  Billie Jean King |
| Champmd: |  John Alexander / Andrés Gimeno[2] |
| Champwd: | Rosie Casals / Billie Jean King |
| Champxd: | Heide Orth / Jürgen Fassbender |
| Before Name: | German Open Championships |
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.[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