| Date: | 20–26 May |
| Edition: | 66th |
| Category: | Grand Prix (B) |
| Surface: | Clay / outdoor |
| Draw: | 64S / 32D |
| Prize Money: | $50,000 |
| Location: | Hamburg, West Germany |
| Champms: |  Eddie Dibbs[1] |
| Champmd: | Jürgen Fassbender / Hans-Jürgen Pohmann[2] |
| Champwd: | Helga Hösl /  Raquel Giscafré |
| Champxd: | Heide Orth / Jürgen Fassbender |
| After Name: | Grand Prix German Open |
| Before Name: | German Open (tennis) |
The 1974 Grand Prix German Open was a combined men's and women's tennis tournament played on outdoor red clay courts. It was the 66th edition of the event and was part of the 1974 Commercial Union Assurance Grand Prix circuit. It took place at the Am Rothenbaum in Hamburg, West Germany, from 20 May through 26 May 1974. Eddie Dibbs and Helga Masthoff won the singles titles.[3]
Eddie Dibbs defeated Hans-Joachim Plötz 6–2, 6–2, 6–3
Helga Masthoff defeated Martina Navratilova 6–4, 5–7, 7–3
Jürgen Fassbender / Hans-Jürgen Pohmann defeated Brian Gottfried / 
Raúl Ramírez 6–3, 6–4, 6–4
Helga Hösl / Raquel Giscafré defeated Martina Navratilova / Renáta Tomanová 6–3, 6–2
Heide Orth / Jürgen Fassbender defeated Katja Ebbinghaus / Hans-Jürgen Pohmann 7–6, 6–3